{"fact":"Demonstrations by human foster parents enhanced the development of tool use in young crows, leading to more frequent handling and insertion of twigs compared to crows without demonstrations.","context":"However, there was also an effect of social learning: juveniles that had received demonstrations of twig tool use by their human foster parent showed higher levels of handling and insertion of twigs than did their na€ıve counterparts.","source":"Ben Kenward; Christian Rutz; Alex A.S. Weir; Alex Kacelnik, Development of tool use in New Caledonian crows: inherited action patterns and social influences, 10.1016/j.anbehav.2006.04.007","index":40}