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All Animals
Amphibians
Bony Fish
Cartilaginous Fish
Invertebrates
Mammals
Reptiles

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.

All Animals

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.

Amphibians

Frogs, toads, salamanders and newts are all amphibians.

Amphibians are a class of cold-blooded vertebrates. They have smooth skin with no scales, and almost all live in moist environments and need to keep their skin damp.

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.

Reptiles

Turtles, alligators and snakes are examples of reptiles.

Members of the class Reptilia are covered in either scales or hard scutes. They are cold-blooded and, thus, depend on their environment and own activity levels to regulate their body temperatures. This allows the animal to live off much less energy and food than a comparably-sized warm-blooded animal.

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.
Alligator Gar
Amazon Puffer
American Alligator
Asian Small-Clawed Otter
Bamboo Shrimp
Banded Archerfish
Bigmouth Buffalo
Black Crappie
Black Spot Piranha
Blue Catfish
Bluegill
Bowfin
Brook Trout
Brown Trout
Channel Catfish
Cichlid
Clown Loach
Common Carp
Crescent Betta
Crescent Betta
Discus
Eastern River Cooter
Emerald-Eye Rasbora
Flagtail Catfish
Flathead Catfish
Forktail Blue-Eye
Freshwater Drum
Harlequin Rasbora
Lake Sturgeon
Lake Tanganyika Cichlids
Longnose Gar
Mosquitofish
Neon Dwarf Rainbowfish
Peacock Gudgeon
Pig-Nosed Turtle
Rainbow Trout
Razorback Musk Turtle
Red Piranha
Redbreast Sunfish
Red-Eared Slider
Redeye Bass
Reticulated Hillstream Loach
Robust Redhorse Sucker
Shovelnose Sturgeon
Smallmouth Buffalo
Spotted Bass
Spotted Gar
Spotted Scat
Yellowbelly Slider