the striking part of a hammer

any of several species of medium-sized sharks with eyes at the ends of bulging projections on each side of the flattened head, so as to have the appearance of a double-headed hammer: genus Sphyrna

an African wading bird related to the stork, with a backward-pointing crest: Scopus umbretta

an African fruit bat with a hammer-shaped muzzle: Hypsignathus monstrosus