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nesting

Common Eiders Favor Close Relatives

Some species of birds try to save energy by tricking others into incubating their eggs. But if the parasitic female is a related species, she may have an advantage. After studying the nests of Common Eiders, such as the one pictured here, researchers at the University of Gothenburg in Sweden... read more »

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Robins Raise a Brood - In a Hurry

When it comes to raising a family, American Robins have got it down. Approximately eight days after the male and female mate, the female builds the nest.  A few days later, she lays eggs. She sits on the eggs for 18 hours a day, and the eggs hatch in about three weeks. Both parents feed the... read more »

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Boreal Forest - North America's Bird Nursery

Nearly half of all the bird species in the United States and Canada – including this Canada Warbler - depend on one amazing resource: the boreal forest. It stretches from the interior of Alaska across northern Canada, all the way to Newfoundland, providing critical habitat for up to three billion... read more »

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Birds, Nests, and Camouflage

Bird nests can be hard to find, often hidden in plain sight. Is the clever camouflage simply the result of using building materials that the birds happen to find? A Scottish research team used birds popular in the pet trade, Zebra Finches, to try and find out. The team gave nesting Zebra Finches... read more »

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Topics & Themes:  nesting, science

The Secret Stash of Eggshells

Developing eggshells requires a key ingredient — calcium — in larger quantities than the female typically has in her bloodstream. Just how different bird species supply or store calcium for egg-laying isn’t fully known. While some species seek out extra calcium from their... read more »

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Burrowing Owls Hiss Like a Rattlesnake!

Despite its name, the Burrowing Owl doesn’t do much digging. It’s better known for its hair-raising hiss, which may have evolved to mimic the warning of a cornered rattlesnake. The sonic threat of a venomous reptile could be just enough to warn away most unwanted visitors from the owl’s nest... read more »

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Topics & Themes:  nesting, science, sound

Inside the burrow of a Rhinoceros Auklet

Everyone knows puffins. Who could forget their comical behavior — with an appearance to match? But you may not know about the Rhinoceros Auklet, a close relative to puffins, found in the Pacific Ocean. Its gray plumage is duller than that of puffins, but during the breeding season it sports a... read more »

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Topics & Themes:  nesting, science

Nesting Red-breasted Sapsuckers

Photographer Gregg Thompson spent several days watching the nest cavity of a pair of Red-breasted Sapsuckers, a species of woodpecker found in far western North America. Cavities are generally excavated in dead trees or dead portions of live trees. Pairs may return to nest in the same area — or... read more »

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Topics & Themes:  nesting, photography

Common Merganser with adorable young!

This small family of Common Mergansers -- a hen with her eight ducklings -- was photographed by Mike Hamilton near Seattle. This duck species nests in tree cavities resulting from broken limbs or excavated by woodpeckers. The female alone incubates the eggs, which hatch in about a month. The... read more »

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Monitoring Rhinoceros Auklets on Protection Island

The nesting colony of Rhinoceros Auklets on Washington State’s Protection Island is among the largest in the world. The birds’ breeding success reflects the health of surrounding marine waters. Scientists are monitoring the type, number, and food value of the fish the adults provide. And to find... read more »

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Topics & Themes:  ecology, nesting, science

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