{"fact":"Crows don't just drop stones into water to get a treat – they actually learn from their successes!  Each time they drop a stone and the water level rises, they're more likely to try it again.","context":"Within tasks, subjects learned from successful (but not unsuccessful) actions... Furthermore, after each stone drop into the water tube, birds were significantly more likely to choose that tube again on the very next drop. We detected no such learning effect when they had previously chosen the sand tube.","source":"Laura Hennefield; Hyesung G. Hwang; Sara J. Weston; Daniel J. Povinelli, Meta-analytic techniques reveal that corvid causal reasoning in the Aesop’s Fable paradigm is driven by trial-and-error learning, 10.1007/s10071-018-1206-y","index":326}