Common dolphins are among the most widespread and recognizable dolphin species in the world. Despite the name, there are actually two main species:

• Short-beaked common dolphin
• Long-beaked common dolphin

🌊 Appearance

Common dolphins are known for their striking coloration:

• A dark gray or black back
• A light underside (white or cream)
• A distinctive hourglass pattern on their sides in tan/yellow and gray

They are relatively small:

• Length: ~6–8 feet (1.8–2.5 m)
• Weight: ~150–300 lbs (70–135 kg)

🌍 Habitat & Range

These dolphins are found in temperate and tropical oceans worldwide, including:

• The Atlantic, Pacific, and Indian Oceans
• Frequently seen off the coast of California, including near Coronado

They prefer open ocean but sometimes come closer to shore.

🐟 Behavior & Diet

• Extremely social—often travel in pods of 100 to 1,000+ individuals
• Known for bow-riding (surfing waves created by boats)
• Feed mainly on:
• Fish (like anchovies and sardines)
• Squid

🧠 Intelligence & Communication

Like other dolphins, they are highly intelligent:

• Use clicks and whistles for communication and echolocation
• Capable of complex group coordination when hunting

⚡ Fun Facts

• Can swim up to 35 mph (56 km/h)
• Frequently perform acrobatic leaps and spins
• Among the most commonly seen dolphins on whale-watching tours

Risso’s dolphins (Grampus griseus) are a unique and easily recognizable species, quite different from the sleek look of bottlenose or common dolphins.

🌊 Appearance

• Stocky body with a blunt, rounded head (no prominent beak)
• Tall, curved dorsal fin
• Color changes with age:
• Younger: dark gray
• Older: light gray to almost white
• Covered in white scars from social interactions and squid prey

Size:

• Length: ~8.5–13 feet (2.6–4 m)
• Weight: ~660–1,100 lbs (300–500 kg)

🌍 Habitat & Range

Risso’s dolphins prefer deeper offshore waters, especially near continental slopes.

• Found worldwide in temperate and tropical oceans
• Common along the coast of California, including waters near Coronado

They’re often spotted farther offshore than bottlenose dolphins.

🐙 Diet

Unlike many dolphins that eat fish, Risso’s dolphins specialize in:

• Squid (their primary food)
• Occasionally fish

They typically hunt at night, when squid rise toward the surface.

🧠 Behavior

• Travel in pods of 10–50 (sometimes larger)
• Less acrobatic than common dolphins, but still capable of:
• Breaching (jumping out of the water)
• Spyhopping (raising head vertically)

They’re known for slow, deliberate movements compared to other dolphins.

🔊 Communication & Sounds

• Use clicks and whistles, but also produce:
• Buzzes
• Burst-pulse sounds for social interaction

⚡ Fun Facts

• Their scars act like a “life history record” of encounters
• They can dive to 1,000+ feet (300+ m) in search of squid
• Older individuals can look almost completely white due to scarring

Minke whales are the smallest of the baleen whales commonly seen in many oceans, but they’re still impressively large and fast swimmers. The most widespread species is the Common minke whale, along with the Antarctic minke whale.

🌊 Appearance

• Sleek, streamlined body
• Dark gray to black back with a lighter underside
• Pointed snout
• Small, curved dorsal fin

A key feature (especially in some populations):

• A white band on the flippers, sometimes called the “minke mittens”

Size:

• Length: ~23–35 feet (7–10.5 m)
• Weight: ~5–10 tons

🌍 Habitat & Range

• Found in all major oceans worldwide
• Adaptable: live in both coastal and offshore waters

They are occasionally spotted off California, including near Coronado, though they’re less commonly seen than larger whales like fin or blue whales.

🐟 Diet

Minke whales are baleen filter feeders.

They eat:

• Small fish (herring, anchovies)
• Krill
• Plankton

They use different feeding techniques depending on the region, including lunge feeding and more subtle, stealthy approaches.

⚡ Behavior

• Usually solitary or in very small groups
• Quick and somewhat elusive—often hard to spot
• Known for:
• Brief surfacing (you may only see the dorsal fin)
• Occasional breaching (jumping out of the water)

🔊 Sounds

• Produce a variety of vocalizations
• Some populations are known for unusual sounds like the mysterious “boing” calls in the Pacific

⚠️ Conservation

• Conservation status varies by species and population
• Generally more stable than many other large whales
• Still affected by:
• Whaling (in some regions)
• Ship strikes
• Ocean noise

Tracked by groups like the International Whaling Commission.

⚡ Fun Facts

• Among the fastest baleen whales
• Can stay underwater for up to 20 minutes
• Often overlooked because of their low-profile surfacing style

Sea lions are playful, intelligent marine mammals known for their loud barks and curious personalities. Along the West Coast, the most common species you’ll see is the California sea lion.

🌊 Appearance

• Streamlined, dog-like body
• External ear flaps (unlike true seals)
• Long front flippers used for “walking” on land

Size:

• Males: up to ~8 feet (2.4 m), 600–800 lbs
• Females: smaller, ~5–6 feet, 200–250 lbs

Males also develop a noticeable forehead bump (called a sagittal crest).

🌍 Habitat & Range

• Found along the Pacific Coast of North America
• Range: from Alaska down to Mexico
• Very common around California, including near Coronado

They gather on:

• Beaches
• Docks and buoys
• Rocky outcrops

🐟 Diet

Sea lions are skilled hunters and eat:

• Fish (anchovies, sardines, mackerel)
• Squid
• Occasionally octopus

They hunt both alone and in groups.

🧠 Intelligence & Behavior

• Highly intelligent and trainable
• Often used in research by organizations like the U.S. Navy Marine Mammal Program
• Very social—live in large colonies

You’ll often hear them before you see them thanks to their:

• Loud barking calls

⚡ Movement

• Excellent swimmers (up to ~25 mph / 40 km/h)
• Can dive to 600 feet (180 m)
• On land, they can rotate their hind flippers to walk—unlike seals

⚠️ Conservation

• Currently not endangered
• Protected under the Marine Mammal Protection Act

Main challenges:

• Entanglement in fishing gear
• Ocean pollution
• Changes in fish availability

⚡ Fun Facts

• Can sleep in the water by floating upright
• Pups recognize their mothers by sound and smell
• Often steal fish from fishing lines (much to fishermen’s frustration!)

The Pacific white-sided dolphin (Lagenorhynchus obliquidens) is one of the most energetic and visually striking dolphins found in the North Pacific.

🌊 Appearance

• Bold, three-tone coloration:
• Dark gray/black back
• Light gray sides
• White belly
• Distinctive light gray “stripe” along the side
• Short beak and sleek, streamlined body

Size:

• Length: ~6–8 feet (1.8–2.5 m)
• Weight: ~300–400 lbs (135–180 kg)

🌍 Habitat & Range

• Found only in the North Pacific Ocean
• Prefer cool, temperate waters
• Common along the coast of California, especially offshore from Coronado

They tend to stay in deeper offshore waters, but sometimes come closer to shore.

🐟 Behavior & Diet

• Extremely social and fast-moving
• Travel in pods of:
• 10–100 individuals (sometimes more)
• Known for:
• High leaps and flips
• Riding waves and boat wakes

Diet includes:

• Fish (anchovies, herring, sardines)
• Squid

🧠 Intelligence & Communication

• Use echolocation clicks to hunt
• Communicate with whistles and body movements
• Highly coordinated when hunting in groups

⚡ Fun Facts

• Can swim up to 30+ mph (48+ km/h)
• Often mix with other dolphin species in “superpods”
• Considered one of the most acrobatic dolphins in the Pacific

The blue whale (Balaenoptera musculus) is the largest animal ever known to have existed on Earth—bigger than any dinosaur.

🌊 Appearance

• Long, sleek body in bluish-gray coloration (often looks light blue underwater)
• Broad, flat head with a U-shaped snout
• Very small dorsal fin far back on the body
• Long, slender shape built for efficient swimming

Size:

• Length: ~80–100+ feet (24–30+ m)
• Weight: ~100–180 tons

A blue whale’s heart alone can weigh as much as a small car.

🌍 Habitat & Range

• Found in all major oceans worldwide
• Prefer deep offshore waters, especially where krill is abundant

Along the U.S. West Coast, they are regularly seen off California, including offshore waters near Coronado, particularly during summer feeding seasons.

🦐 Diet

Blue whales are baleen filter feeders and eat almost exclusively:

• Krill (tiny shrimp-like crustaceans)

They can consume:

• Up to 4 tons of krill per day during peak feeding

Feeding method:

• Take huge lunges of water
• Expand throat pleats
• Filter krill through baleen plates

🔊 Communication

• Produce some of the loudest and lowest-frequency sounds in the animal kingdom
• Calls can travel hundreds of miles underwater
• Likely used for long-distance communication and mating

⚡ Behavior

• Usually seen alone or in small groups
• Despite their size, they are graceful and fast swimmers
• Blow (spout) can rise 30 feet (9 m) into the air

⚠️ Conservation Status

• Listed as Endangered
• Populations were heavily reduced by commercial whaling

Current protections and monitoring are supported by organizations like the International Whaling Commission and the National Oceanic and Atmospheric Administration.

Main threats today:

• Ship strikes
• Ocean noise pollution
• Climate-driven changes in krill availability

⚡ Fun Facts

• A blue whale’s tongue alone can weigh as much as an elephant
• A calf drinks around 100 gallons (380 liters) of milk per day
• They can reach speeds of 20+ mph (32 km/h) in short bursts

Orcas, also known as killer whales, are the largest members of the dolphin family and one of the ocean’s most powerful predators. Their scientific name is Orcinus orca.

🌊 Appearance

• Striking black-and-white coloration
• Tall, triangular dorsal fin (especially large in males—up to ~6 feet / 1.8 m)
• White patches:
• Behind the eye (“eye patch”)
• Under the belly
• Near the flanks

Size:

• Males: ~20–26 feet (6–8 m), up to ~12,000 lbs
• Females: ~16–23 feet (5–7 m), smaller and more slender

🌍 Habitat & Range

Orcas are found in every ocean on Earth, from polar regions to tropical waters.

They are occasionally seen off California, including near Coronado, especially during migrations of prey species like gray whales.

🐟 Diet & Hunting

Orcas are apex predators, meaning they have no natural predators.

Their diet varies by “ecotype” (regional groups):

• Fish (salmon, herring)
• Squid
• Marine mammals (seals, sea lions, dolphins)
• Occasionally large whales (including calves)

They use highly coordinated hunting strategies, such as:

• Wave-washing seals off ice
• Cooperative “carousel feeding” to trap fish
• Team hunting of whales

🧠 Intelligence & Culture

Orcas are among the most intelligent marine animals:

• Live in tight family groups called pods
• Use distinct vocal dialects (like regional languages)
• Teach hunting techniques across generations

Some populations are studied by organizations like the National Oceanic and Atmospheric Administration.

🔊 Communication

• Produce clicks, whistles, and pulsed calls
• Each pod has its own signature vocal patterns
• Sound is used for coordination and social bonding

⚡ Behavior

• Highly social and matriarchal (led by older females)
• Fast swimmers (up to ~35 mph / 56 km/h)
• Known for breaching, spyhopping, and playful behavior

⚠️ Conservation

• Global population status varies by region
• Some populations are stable, while others are endangered
• Threats include:
• Loss of prey (especially salmon in some regions)
• Ocean pollution (PCBs, toxins)
• Noise interference

⚡ Fun Facts

• Orcas are actually the largest dolphins, not whales in the strict taxonomic sense
• No verified natural predators
• Different populations have completely different “cultures” and hunting styles

The sperm whale (Physeter macrocephalus) is the largest of the toothed whales and one of the deepest-diving mammals on Earth. It’s famous for its massive square head and its role in the classic novel Moby-Dick.

🌊 Appearance

• Enormous block-shaped head (about 1/3 of body length)
• Wrinkled, dark gray to brown body
• Narrow lower jaw lined with large teeth (only on the bottom jaw)
• Distinctive low, bushy blow angled forward and to the left

Size:

• Males: ~50–60+ feet (15–18+ m)
• Females: ~30–40 feet (9–12 m)
• Weight: up to ~45 tons

🌍 Habitat & Range

• Found in deep oceans worldwide
• Prefer deep water near continental slopes and submarine canyons

They are occasionally seen off California, including offshore areas near Coronado, especially where deep water drops off quickly.

🦑 Diet & Feeding

Sperm whales are specialized hunters of deep-sea prey:

• Mainly giant and deep-sea squid
• Also fish and other deep-ocean creatures

They perform some of the deepest dives of any animal:

• Typical dives: 1,000–3,000 feet (300–900 m)
• Maximum recorded: over 10,000 feet (3,000 m)

They use echolocation “clicks” to locate prey in total darkness.

🧠 Brain & Communication

• Possess the largest brain of any known animal
• Use powerful click patterns called “codas”
• Communicate within family groups (often called pods or clans)

Researchers like those at National Oceanic and Atmospheric Administration study their complex social behavior.

⚡ Behavior

• Live in matriarchal family groups (females and young)
• Adult males often travel alone or in small bachelor groups
• Spend long periods deep underwater hunting
• Surface for rest, breathing, and socializing

🔊 The “Clicking Whale”

• Produce some of the loudest sounds in the animal kingdom
• Their echolocation clicks can be used both for:
• Navigation
• Stunning or detecting prey

⚠️ Conservation

• Once heavily hunted during commercial whaling
• Now protected internationally and recovering slowly
• Ongoing threats include:
• Ship strikes
• Ocean noise pollution
• Plastic ingestion

⚡ Fun Facts

• Their head contains a large organ once called the “spermaceti organ” (used for sound focusing and buoyancy control)
• They can hold their breath for over 90 minutes
• They are one of the most socially complex whale species

Beaked whales are one of the most mysterious groups of marine mammals. They belong to a deep-diving family of toothed whales called Ziphiidae. One example is the Cuvier’s beaked whale, one of the most commonly encountered beaked whale species worldwide.

🌊 Appearance

Beaked whales are built for deep diving and are often hard to identify at sea.

• Long, torpedo-shaped body
• Small dorsal fin set far back
• Slender “beak-like” snout (varies by species)
• Males often have visible tusk-like teeth (used for fighting, not feeding)

Size (varies by species):

• ~13–43 feet (4–13 m)
• Generally medium-to-large sized whales

🌍 Habitat & Range

• Found in deep oceans worldwide
• Strongly associated with steep underwater canyons and continental slopes
• Rarely seen near shore unless deep water is close

Along California, including offshore areas near Coronado, beaked whales may occur in deep submarine canyon systems, but sightings are very rare.

🦑 Diet & Feeding

Beaked whales are deep-sea squid specialists.

They feed on:

• Squid (primary food source)
• Deep-sea fish
• Occasional crustaceans

They are among the deepest-diving mammals on Earth, with dives often:

• 1,000–3,000+ feet (300–1,000+ m)
• Sometimes lasting over an hour

They use suction feeding rather than biting prey.

⚡ Behavior

• Usually solitary or in small groups (2–7 animals)
• Extremely elusive—most knowledge comes from strandings and acoustic studies
• Spend very little time at the surface
• Often surface briefly and then disappear for long dives

🔊 Communication

• Produce high-frequency echolocation clicks
• Less vocal than many dolphins, making them harder to study
• Some species are sensitive to underwater noise

⚠️ Conservation

• Many species are poorly understood due to their deep-water lifestyle
• Threats include:
• Naval sonar (linked to strandings in some cases)
• Fishing gear entanglement
• Ocean noise pollution

Monitored by organizations such as the National Oceanic and Atmospheric Administration.

⚡ Fun Facts

• Some species are so rarely seen that much of what we know comes from acoustic recordings only
• They are considered among the most elusive large mammals on Earth
• Males of some species use their teeth in sparring battles, leaving scars

Elephant seals are massive, deep-diving marine mammals named for the adult male’s large, trunk-like nose. The two species are:

• Northern elephant seal (common along California)
• Southern elephant seal (mostly sub-Antarctic)

Along the California coast, including near Coronado, you’ll only see the northern elephant seal.

🌊 Appearance

• Extremely large, barrel-shaped body
• Males have a large “elephant trunk” nose (used for loud roaring)
• Thick, wrinkled skin that looks almost elephant-like
• Females are much smaller and sleeker

Size:

• Males: up to ~13–16 feet (4–5 m), 2,000–5,000+ lbs
• Females: ~9–12 feet (3–3.7 m), 900–1,800 lbs

🌍 Habitat & Range

• Spend most of their lives at sea in the open Pacific Ocean
• Only come ashore to breed, give birth, and molt
• Major colonies along California include Año Nuevo, Point Reyes, and Piedras Blancas

Near San Diego, they’re usually seen offshore in winter and spring, or occasionally hauled out farther north.

🐟 Diet & Diving

Elephant seals are among the deepest-diving mammals on Earth:

They eat:

• Squid
• Deep-sea fish
• Rays and other midwater prey

Diving abilities:

• Depths over 5,000 feet (1,500+ m)
• Dives lasting up to 2 hours
• Spend ~90% of their life underwater

⚡ Behavior

• Extremely aggressive during breeding season (males fight for territory)
• On land, they gather in large noisy colonies called rookeries
• At sea, they are mostly solitary

Males produce loud, roaring calls using their inflatable nasal structure.

🔊 Communication

• On land: loud roars, grunts, and bellows
• Underwater: quieter sounds used for navigation and interaction
• Vocal intensity increases dramatically during mating season

⚠️ Conservation

• Once heavily hunted for oil in the 1800s
• Now a major conservation success story
• Populations along California have recovered strongly

Still protected under the Marine Mammal Protection Act.

⚡ Fun Facts

• Males can fast for months during breeding season
• Their noses act like a resonating chamber for sound
• Despite their size, they are agile swimmers in deep water

The ocean sunfish, also known as the mola mola, is one of the most unusual-looking fish in the ocean. Its scientific name is Mola mola.

It’s famous for its giant, disc-shaped body and strange “floating head” appearance.

🌊 Appearance

• Large, flattened, almost circular body
• No true tail fin—instead a clavus (stiff steering fin)
• Very small mouth compared to body size
• Smooth skin often covered with parasites

Size:

• Length (fin to fin): up to ~10–11 feet (3 m)
• Weight: ~1,000–5,000 lbs (450–2,300 kg)

Despite their size, they look almost like a floating head with fins.

🌍 Habitat & Range

• Found in temperate and tropical oceans worldwide
• Often seen near the surface, but also dives deep

They occasionally appear off California, including offshore waters near Coronado, especially during warm-water periods.

🐟 Diet

Ocean sunfish eat soft-bodied prey such as:

• Jellyfish (primary food)
• Salps
• Small fish and plankton

They must eat large volumes of low-nutrient food to sustain their massive bodies.

⚡ Behavior

• Often seen basking at the surface (“sunbathing” behavior)
• Can drift vertically or sideways in the water
• Strong deep divers, reaching several hundred meters

They are generally slow swimmers, relying on ocean currents.

🧠 Biology & Adaptations

• Can produce millions of eggs at a time (among the highest of any vertebrate)
• Frequently covered in parasites, which attracts cleaning fish
• Have a very unusual body shape among bony fish

⚠️ Conservation

• Not currently endangered
• Threats include:
• Plastic pollution (mistaken for jellyfish)
• Bycatch in fishing nets
• Boat strikes

⚡ Fun Facts

• The largest bony fish in the world
• Can jump fully out of the water (breaching behavior)
• Often mistaken for floating debris due to their odd shape

Sharks are a diverse group of cartilaginous fish that have been in Earth’s oceans for over 400 million years—long before dinosaurs. They range from tiny reef species to massive open-ocean predators.

Along the waters off California, including near Coronado, several shark species are commonly encountered.

🐋 Common Sharks in Southern California

🦈 Great White Shark

Great white shark

• Large apex predator
• Found in cool, coastal waters
• Often associated with seal and sea lion colonies
• More common offshore or seasonally near shore (especially juveniles in California)

🦈 Leopard Shark

Leopard shark

• Harmless to humans
• Common in shallow bays and sandy bottoms
• Distinctive dark saddle-like markings
• Frequently seen in California coastal waters

🦈 Hammerhead Shark

Scalloped hammerhead shark

• Unique “hammer-shaped” head for sensing prey
• Often travels in schools
• More common in warmer offshore waters

🦈 Mako Shark

Shortfin mako shark

• One of the fastest sharks in the ocean
• Open-water hunter of fast fish like tuna
• Rare near shore, more common offshore Southern California

🦈 Blue Shark

Blue shark

• Slender, deep-blue coloration
• Highly migratory open-ocean species
• One of the most commonly caught offshore sharks (usually far from shore)

🌊 Habitat & Behavior

• Sharks live in all oceans, from shallow surf zones to deep sea
• Some species are coastal (like leopard sharks), others are pelagic (open ocean)
• Many species migrate long distances following temperature and prey

🧠 Senses & Hunting

Sharks are highly specialized predators:

• Electroreception: detect tiny electrical signals from prey
• Strong sense of smell
• Excellent motion detection in low light
• Many use ambush or high-speed pursuit strategies

⚠️ Conservation

Many shark populations are under pressure globally due to:

• Overfishing and bycatch
• Demand for fins and meat
• Slow reproductive rates

Organizations like the National Oceanic and Atmospheric Administration monitor shark populations and manage protections in U.S. waters.

⚡ Fun Facts

• Sharks do not have bones—their skeletons are made of cartilage
• Some species must swim constantly to breathe, while others can rest on the seafloor
• Leopard sharks are among the most commonly seen sharks in California tide pools and shallow bays
• Great whites can detect a drop of blood in millions of gallons of water

Flying fish are small ocean fish famous for their ability to glide above the water’s surface to escape predators. The most common type belongs to the family Exocoetidae.

They don’t truly “fly” like birds—they glide using wing-like fins.

🌊 Appearance

• Slender, torpedo-shaped body
• Very large pectoral fins (look like wings)
• In some species, enlarged pelvic fins as well
• Silvery-blue coloration for camouflage

Size:

• Typically ~6–18 inches (15–45 cm), depending on species

🌍 Habitat & Range

• Found in warm tropical and subtropical oceans worldwide
• Often near the surface of open water
• Frequently seen in the Pacific Ocean, including offshore waters near California, especially farther offshore from Coronado

🪽 How They “Fly”

Flying fish use a three-step escape strategy:

1. Burst swimming: They accelerate rapidly underwater
2. Launch: They break the surface at high speed
3. Glide: Spread fins and glide above waves for up to 200–650 feet (60–200 m)

Some species can even make repeated “hops” across the water.

🐟 Diet & Predators

• Feed on:
• Plankton
• Small crustaceans
• Fish eggs

They are preyed upon by:

• Tuna
• Marlin
• Dolphins
• Seabirds

⚡ Behavior

• Often travel in schools near the surface
• Most active at night
• Use gliding as a defense mechanism against fast predators

⚡ Fun Facts

• Their “flight” is actually a controlled glide powered by tail beats on water
• Some species can stay airborne for nearly 30 seconds
• Sailors historically used them as indicators of warm-water currents
• They are sometimes seen jumping in groups, creating the illusion of “rain” above the ocean