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Crows sometimes place nuts on the road so their tough shells can be broken open by passing vehicles. They even know to wait for the red light of traffic signals to retrieve the nuts.
Crows sometimes place nuts on the road so their tough shells can be broken open by passing vehicles. They even know to wait for the red light of traffic signals to retrieve the nuts.
Puffins have been observed scratching themselves with sticks, the first evidence of seabirds using tools.
Crows use and manipulate tools