BRISTOL, England, Aug. 11 (UPI) -- Scientists recently found dozens of baby Orthacanthus shark teeth in ancient coprolites -- fossilized feces -- deposited by adult Orthacanthus sharks. The evidence suggests the prehistoric freshwater shark cannibalized its young.
The evidence is pretty clear. There's no mistaking the juvenile teeth or the owner of the coprolites. Orthacanthus possessed spiral-shaped rectums, making their ancient waste deposits quite distinctive.