Carrion crows understand probability Shutterstock/Rudmer Zwerver
Crows can make decisions according to the likelihood of getting a reward 鈥 a cognitive feat known to mathematicians as statistical inference, and rarely found outside of primates.
鈥溾楤ird brain鈥 is often used as an insult, but that鈥檚 not really the case,鈥 says at the University of Tubingen in Germany.
Her team trained two carrion crows (Corvus corone) to peck at nine, different-coloured symbols to receive a reward: a small food pellet or worms. Over hundreds of trials, they were taught that each symbol was associated with a different probability of…
