1 (also loggerhead turtle) a reddish-brown turtle with a very large head, occurring chiefly in warm seas.
- Caretta caretta, family Cheloniidae
2 (also loggerhead shrike) a widespread North American shrike, having mainly gray plumage with a black eyestripe, wings, and tail.
- Lanius ludovicianus, family Laniidae
3 archaic a foolish person.