South African plant, medicinal uses.

Euryale ferox, commonly known as prickly waterlily, makhana, or Gorgon plant, is a species of water lily found in southern and eastern Asia, and the only extant member of the genus Euryale.

Cryptoprocta ferox: carnivorous mammal native Madagascar.

(syn. A. virorum) a member of the monkshood genus Aconitum of the Ranunculaceae.

(Salmo ferox) a variety of trout found in oligotrophic lakes/lochs of Ireland, England, Scotland and Wales.

Encephalartos ferox, a member of the family Zamiaceae, is a small cycad with 35 cm wide subterranean trunk.

Cannibal Ferox, also known as Make Them Die Slowly in the US and as Woman from Deep River in Australia, is a 1981 Italian cannibal exploitation horror film written and directed by Umberto Lenzi.

Urtica ferox, commonly known as tree nettle and, in Māori, , , , оr , is a species of nettle endemic to New Zealand.

Amaurobius ferox, sometimes known as the black lace-weaver, is a common nocturnal spider belonging to the family Amaurobiidae and genus Amaurobius.

(also known as Riokku (リオック, loanword from the Indonesian name) or Obakekorogisu (オバケコロギス, "Obake raspy cricket") in Japan) a species of cricket that lives in Indonesia.