A) how to cooperate with other birds. B) the concept of time passing. C) the use of water displacement. D) human facial recognition.
Corvids have also been observed exhibiting complex social behavior, including cooperation and communication. For example, when a crow finds food, it will often call other crows to the location, using a variety of vocalizations to convey information about the food and its location.
: Ensure the text explicitly confirms a behavior; don't assume a bird can do something just because it seems "smart" enough. elearn.edu.vn
: These birds can remember the locations of hundreds of different food caches.
Perhaps the most striking demonstration of corvid intelligence is their ability to use and manufacture tools. The New Caledonian crow, for instance, is known to craft hooks from twigs to extract insects from tree bark. Unlike instinctive behaviours, this skill is learned and refined through observation and experience. In controlled experiments, these crows have spontaneously bent wires into hooks to retrieve out-of-reach food, a feat not mastered by most primates without training. Similarly, rooks have been observed dropping stones into a water-filled tube to raise the water level – a behaviour reminiscent of Aesop’s fable – indicating an understanding of cause and effect.
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