Inspired, Mei decided to test their problem-solving with a simple experiment. She placed a shiny button on a low table and watched. The crows arrived in a black, gossiping cloud. One crow, smaller than the rest, hopped onto the table, tapped the button with a toe, and hopped back. The button triggered a small compartment of peanuts. The flock erupted in triumphant caws. Over the next week Mei adjusted the task: they had to pull a string, push a lever, and later, to combine steps in sequence.
: Studies on rooks demonstrated they could coordinate efforts, such as pulling two ends of a rope simultaneously to access food. Inspired, Mei decided to test their problem-solving with
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If you encounter a real IELTS passage on corvids (Cambridge IELTS 14, Test 3 has a similar passage on animal cognition), remember three core themes: One crow, smaller than the rest, hopped onto