Animals

Frogs as pets

Frostius

Frostius — a small genus of true toads

Frugivore

Frugivore: animals that feed primarily on fruit

Fruitadens

Fruitadens — a small heterodontosaur from the Morrison Formation

Fruitafossor

Fruitafossor — a termite‑eating mammal from the Late Jurassic

Fur

Fur: structure, functions, and human uses

Fur is the dense hair coat of many mammals. It insulates, camouflages, and protects; its structure varies by species and environment and has been used and managed by humans for mil

Fur seal

Fur seals — biology, distribution, and conservation

Furcula

Furcula (wishbone): anatomy, function, and evolution

Futabasaurus

Futabasaurus — an elasmosaurid plesiosaur from Japan

Gadfly

Galago

Galago (bushbaby): overview, traits, behavior and conservation

Galápagos penguin

Galapagos shark

Gall wasp

Gall wasp (Cynipidae): biology, galls, and ecological role

Galliformes

Gallimimus

Game bird

Game fish

Gannet

Gansus

Gansus — Early Cretaceous aquatic bird genus

Gar

Gar (family Lepisosteidae): ancient armored freshwater predators

Garden dormouse

Garden dormouse (Eliomys quercinus)

Gargoyleosaurus

Gargoyleosaurus — armored ankylosaur from the Morrison Formation

Garter snake

Garter snakes (Thamnophis): biology, distribution, and interactions with people

Gastornis

Gastornis (extinct flightless bird)

Gastrolith

Gastrolith (gizzard stone): function, history, and identification

Gastroliths are stones swallowed and retained in the digestive tract of some animals to grind food or act as ballast; they are important in modern biology and paleontology.

Gastropoda

Gastropoda: snails, slugs and related gastropod molluscs

Gastrotrich

Gastrotrich (Gastrotricha): tiny aquatic animals called hairybacks

Gaur

Gavialidae

Gavialidae — the long‑snouted crocodilian family

Gavialis

Gavialis: the gharial genus and its long-snouted relatives

Gazelle

Gazelle: biology, habitat, and behavior

Gecko

Gemsbok

Genet

Gentoo penguin

Gentoo Penguin (Pygoscelis papua): Description, Behavior and Habitat

Geoffroy's cat

Geometer moth

Geometer moth (family Geometridae): overview, life stages, and significance

Geomyoidea

Gerbil

Gerbil: small desert-adapted rodents and common pets

German Shepherd

German Shepherd — breed overview, history, characteristics and uses

Gharial

Ghost frog

Ghost frog (Heleophrynidae)

Giant anteater

Giant anteater (Myrmecophaga tridactyla): appearance, behavior, and habitat

Giant armadillo

Giant armadillo (Priodontes maximus)

Giant octopus

Giant panda

Giant salamander

Giant salamander (family Cryptobranchidae)