300-Million-Year-Old Shark Was a Cannibal

Baby teeth in a fecal sample confirm an ancient marine predator ate the young of its own kind.

Published On 08/11/2016
4:00 PM EDT
Shown is a sample of Orthacanthus feces, with a black box indicating the tooth of a juvenile Orthacanthus. Credit: Aodhán Ó Gogáin (Trinity College Dublin)