Animals

Alpine marmot

Alpine marmot (Marmota marmota)

Alpine newt

Alpine newt (Ichthyosaura alpestris)

Altiphrynoides

Altiphrynoides: Ethiopian highland toads

Altispinax

Alvarezsaurus

Alvarezsaurus: a small Late Cretaceous theropod from Argentina

Alxasaurus

Amami rabbit

Amami rabbit (Pentalagus furnessi)

Amargasaurus

Amargosa toad

Amazonsaurus

Amazonsaurus — a rebbachisaurid sauropod from the Early Cretaceous

Amber-colored salamander

Amber-colored salamander (Hynobius stejnegeri)

Amblypygi

Amblypygi — whip spiders and tailless whip scorpions

Ambulocetus

Ambulocetus — an early amphibious whale

American badger

American badger (Taxidea taxus): natural history, behaviour, and role in grassland ecosystems

American bison

American bison: biology, ecology, history, and significance

American black bear

American black bear (Ursus americanus)

American Bobtail

American Bobtail (cat breed)

American Cocker Spaniel

American crocodile

American crocodile (Crocodylus acutus)

American crow

American crow (Corvus brachyrhynchos)

American Curl

American Curl — Cat Breed Overview

American Eskimo Dog

American Foxhound

American Hairless Terrier

American lion

American lobster

American lobster (Homarus americanus): biology, fishery and conservation

American Pit Bull Terrier

American Pit Bull Terrier: origin, traits, temperament and modern role

American plaice

American plaice: biology, habitat, fisheries and conservation

American robin

American Shorthair

American Shorthair (cat): history, characteristics, and care

American spadefoot toads

American Staffordshire Terrier

American toad

American toad (Anaxyrus americanus)

Ameridelphia

Ameridelphia — historical grouping of New World marsupials

Amietophrynus

Amniote

Amolops himalayanus

Ampedus

Ampedus: a genus of click beetles

Ampharos

Ampharos — Electric-type Pokémon (Generation II)

Amphibian

Amphibian: biology, life cycle, evolution and conservation

Overview of amphibians (class Amphibia): major groups, anatomy, life cycle, fossil origins, diversity, habitats and modern conservation challenges.

Amphicoelias

Amphicoelias: a sauropod from the Morrison Formation

Amphipod

Amphipod (Amphipoda): biology, diversity and ecological roles

Amphisbaenia

Amphisbaenia (worm lizards): burrowing squamates

Amphiuma

Amphiuma — elongated aquatic salamanders of the family Amphiumidae

Ampullariidae

Ampullariidae (apple snails): biology, distribution, and human interactions

Amur leopard

Anaconda

Anatidae

Anatidae: the ducks, geese and swans (waterfowl family)