Animals

Feathertail glider

Felidae

Feliformia

Felinae

Felinae: the small-cat subfamily — traits, evolution, and notable species

Felis

Felis — the genus of small cats including the domestic cat

Fennec fox

Ferret

Ferret: domestic mustelid (Mustela putorius furo) — traits, history and care

Filter feeder

Filter feeder: organisms that capture suspended food from water

Fin whale

Fin whale (Balaenoptera physalus) — the fast rorqual

Finch

Finch: overview, characteristics, taxonomy, and relationship with humans

Finches are small passerine songbirds noted for stout, seed‑crushing bills, diverse plumage and songs, and a complex taxonomy; important in ecological roles, aviculture and studies

Finless porpoise

Fiordland penguin

Fire ant

Fire salamander

Firefly

Firefly (Lampyridae): the bioluminescent 'lightning bugs'

Fish

Fish: diversity, anatomy, evolution, and human importance

Fish are aquatic vertebrates with gills and fins; this article covers their anatomy, major groups, habitats, evolution, uses, and conservation concerns.

Fish lice

Fish lice (Argulidae): parasitic crustaceans of freshwater fish

Fishing cat

Fishing cat (Prionailurus viverrinus): wetland specialist of South and Southeast Asia

Flame-throated bulbul

Flame-throated bulbul (Rubigula gularis)

Flamingo

Flamingo: Ecology, Behavior, and Species of the Family Phoenicopteridae

Flanimals

Flatback turtle

Flatback turtle (Natator depressus): biology, range and conservation

Flatfish

Flatfish: biology, adaptations, and human uses

Flatworm

Flatworm (Platyhelminthes): biology, classification, and impact

Flea

Flea (Siphonaptera): biology, lifecycle, health effects and control

Flemish Giant rabbit

Flesh-footed shearwater

Flesh-footed Shearwater (Puffinus carneipes)

Flightless birds

Flightless birds: characteristics, evolution, and human interactions

Flounder

Fly

Fly (Diptera): anatomy, behavior, diversity and human significance

Flying fish

Flying fish: gliding marine fishes of the family Exocoetidae

Flying frog

Flying frog (gliding treefrog)

Flying possum

Flying possum (gliding marsupials)

Flying squirrel

Flying squirrel: nocturnal gliding rodents of the Sciuridae family

Foot-and-mouth disease

Foot-and-mouth disease (FMD)

Forest dormice

Forest dormouse

Forest dormouse (Dryomys nitedula)

Formicariidae

Formicariidae — ground antbirds of Central and South America

Fossa

Fossa (Cryptoprocta ferox): Madagascar's Largest Native Carnivore

Four-horned antelope

Four-horned antelope (Tetracerus quadricornis)

Fowl

Fowl (Galloanserae): landfowl and waterfowl

Fox

Fraser's dolphin

Fraser's dolphin (Lagenodelphis hosei): oceanic pelagic dolphin

French Bulldog

Freshwater crab

Friesian horse

Friesian Horse — Dutch Breed Characterized by Black Coat, Feathering, and Animated Trot

Frill-necked lizard

Frog

Frog (order Anura): biology, life cycle, ecology, and human interactions