{"fact":"Rooks, close relatives of crows, demonstrate problem-solving skills by dropping stones into water to raise the level and reach a floating worm.","context":"Rooks that drop stones in water to reach a floating worm are undoubtedly using L-cognition — handling information in an adaptive way","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":284}