Diplocaulus was a genus of amphibian that lived
during the Permian period between about 298 and 251
million years ago.
Diplocaulus was about 3 feet (1 meter) long,
and had an unusual boomerang-shaped head. It is not
entirely clear what the purpose of this head shape
was: it may have made it harder for predators to swallow,
it could have helped the creature glide through the water,
it could have been used to attract mates, or perhaps
some combination of these.
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