{"fact":"Unlike human hunter-gatherers, male and female New Caledonian crows don't divide tool use along gender lines.","context":"In spite of sexual size dimorphism in crows...there was no significant relationship between the sex of crows and the type of tool that they preferred to use...This shows that parallel tool industries in New Caledonian crows, and associated foraging niche partitioning, are not based on a rigid division of labour between the sexes.","source":"Gavin R Hunt; Russell D Gray, Parallel tool industries in New Caledonian crows, 10.1098/rsbl.2006.0603","index":548}