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Northern Pygmy-Owl (Glaucidium gnoma)

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An Owl Is Mobbed

A pint-sized Northern Pygmy-Owl, not much bigger than a pine cone, hoots from a tree-top on a winter morning. Before long, this diurnal owl - a determined predator of small birds and mammals - will attract a mob of a dozen or more small birds. Mobbing may be a collective response to danger. But... read more »

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Pygmy-Owls' False Eyes

This Northern Pygmy-Owl appears to have eyes in the back of its head. But why? One theory is that large false eyes may create the illusion that the owl is much bigger than its 6 and 3/4-inch size. A more current theory is that the false eyes help protect the pygmy-owl's true eyes. Small birds... read more »

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Birds' Early Warning Systems

A frantic cacophony of loud, rapid birdcalls tells other birds there’s a predator on the prowl. It’s called “mobbing” as birds clamor and dart — back and forth — at the threat. An ongoing study of mobbing and other bird warning behavior suggests that some birds listen in on the warnings of other... read more »

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Topics & Themes:  ecology
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