A shark of the genus Sphyrna or Zygæna, having the eyes set on projections from the sides of the head, which gives it a hammer shape. The Sphyrna zygæna is found in the North Atlantic. Called also hammer fish, and balance fish.
- The head of a hammer.
- Any of several predatory sharks of the genus Sphyrna, having the sides of the head elongated into fleshy extensions with the eyes at the ends.
- A wading bird (Scopus umbretta) of Africa and southwest Asia, having brown plumage, a large bladelike bill, and a long backward-pointing crest. Also called hammerkop, umbrette.
- An African fruit bat (Hypsignathus monstrosus), the male of which has a distinctive enlarged head.