TOKYO: Crows have a long-term memory so good that they can recall colours for at least a year, a Japanese study has shown.
Birds that had identified which of two containers held food by the colour of its lid were still able to perform the task 12 months later, said Shoei Sugita, a professor of animal morphology at Utsunomiya University.
Sugita said 24 birds were given the choice between containers with a red and green lid, which held food, and containers with a yellow and blue lid, which did not.
After they had mastered the task, the crows were divided into groups and tested to see if they could recall the information they had learned. Read more
Birds that had identified which of two containers held food by the colour of its lid were still able to perform the task 12 months later, said Shoei Sugita, a professor of animal morphology at Utsunomiya University.
Sugita said 24 birds were given the choice between containers with a red and green lid, which held food, and containers with a yellow and blue lid, which did not.
After they had mastered the task, the crows were divided into groups and tested to see if they could recall the information they had learned. Read more
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