@article{ref1,
title="Animal behaviour: lethal violence deep in the human lineage",
journal="Nature",
year="2016",
author="Pagel, Mark",
volume="538",
number="7624",
pages="180-181",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0028-0836",
doi="10.1038/nature19474",
url="http://dx.doi.org/10.1038/nature19474"
}