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All Animals
Birds
Bony Fish
Cartilaginous Fish
Invertebrates
Mammals

Bony Fish

Grouper, sea horses and eels are a few examples of the more than 30,000 species of bony fish.

The skeletons of these animals (Class Osteichthyes) are composed of bone. All bony fish have gills, which are essential for breathing in most species. They also possess a swim bladder, which helps manage neutral balance so the fish neither sinks nor floats. These fish need not continuously swim to breathe.

Cartilaginous Fish

Sharks, rays, skates and chimaera are cartilaginous fish.

The skeletons of these animals (Class Chondrichthyes) are composed of cartilage instead of bone. Their bodies are covered with dermal denticles, providing a smooth appearance. Depending on species, they will have 5-7 gills for breathing. Many must continuously swim to breathe.

All Animals

Birds

Penguins, seagulls and pelicans are examples of birds.

The class Aves can be distinguished by their beaks, feathers and wings. They are egg-laying and most species form socially monogamous pairs. Flying birds have hollow bones while marine birds, like penguins, have dense bones to allow for submersion.

Mammals

Otters, whales, seals and humans are examples of mammals.

Mammals have five defining characteristics.

They...
... are warm-blooded – their body temperature remains constant.
... have hair or fur.
... give live birth.
... breathe air through lungs.
... nurse their young.

Invertebrates

Crabs, snails, anemones, jellies and sea stars are just a few examples of invertebrates.

Invertebrates are animals that do not have a spine or vertebral column. They do not have skeletons or bone. Overall, they are incredibly diverse: approximately 97% of all animal species are invertebrates. For this reason, they must be classified into more than 30 phyla - from sponges to arthropods.
African Penguin
Bat Star
Beluga Whale
Black Rockfish
Blacksmith
Blue Rockfish
Copper Rockfish
Fish-eating Anemone
Garibaldi
Giant Keyhole Limpet
Giant Pacific Octopus
Giant Red Sea Cucumber
Golden Goby
Harbor Seal
High Cockscomb
Japanese Spider Crab
Kelp Greenling
Longspine Snipefish
Mottled Sea Star
Northern Spearnose Poacher
Ochre Sea Star
Painted Greenling
Pink Sea Star
Pot-Bellied Seahorse
Purple Sea Urchin
Quillback Rockfish
Rainbow Sea Star
Roughback Sculpin
Sailfin Sculpin
Snailfish
Southern Sea Otter
Spot Prawn
Spotted Ratfish
Sturgeon Poacher
Swellshark
Tidepool Sculpin
Vermillion Sea Star
Weedy Sea Dragon