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Researchers discover surprising reason for birds' strange behavior in US region: 'It's worth the energy'

"They are responding to this.' Researchers discover surprising reason for birds' strange behavior in US region: 'It's worth ...
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Why do hawks put up with mobbing by crows? | ECOVIEWS

Crows are no match for a larger predator like a hawk. So why is their mobbing behavior not met with an attack?