{"fact":"Crows understand tool functionality. When presented with a tube too small for a stone, they show surprise, demonstrating an understanding of size and tool use.","context":"Core knowledge may also play a part, as when subjects, be they naïve corvids or human infants, show surprise when a stone fits inside a tube smaller than itself in a violation of expectancy paradigm.","source":"Tim Bayne; David Brainard; Richard W. Byrne; Lars Chittka; Nicky Clayton; Cecilia Heyes; Jennifer Mather; Bence Ölveczky; Michael Shadlen; Thomas Suddendorf; Barbara Webb, What is cognition?, 10.1016/j.cub.2019.05.044","index":282}