A trio of ethologists at the University of Pisa has documented and analyzed an instance of infant cannibalism in a drill monkey. In their paper published in the journal Primates, Grazia Casetta, Andrea Paolo Nolfo and Elisabetta Palagi describe the scenario recorded on videotape and offer possible explanations for the behavior they witnessed.
Click here for original story, Evidence of infant cannibalism found in a drill monkey
Source: Phys.org