any shark of the genus Sphyrna and family Sphyrnidae, having a flattened hammer-shaped head
2.
a heavily built tropical African wading bird, Scopus umbretta, related to the herons, having a dark plumage and a long backward-pointing crest: family Scopidae, order Ciconiiformes
3.
a large African fruit bat, Hypsignathus monstrosus, with a large square head and hammer-shaped muzzle