By including this sturdy spider silk, the birds make their nests exceptionally durable; Russell points out that the museum ... White-winged choughs pile mud in layers, with each layer given ...

A flamingo looks like a bird cooked up by an exuberant preschooler ... With its hooked bill it scrapes up clumps of mud to make a nest. Stiff bristles inside its bill filter water containing ...

In the case of American robins, mud ... nest starts out only large enough to just fit the female but later must accommodate two babies as they grow. This is amazing planning. Primary cavity ...

The newest residents, thousands of barn swallows and cliff swallows, are making themselves unwelcome by building mud nests under the eaves. "I don't want them flying around and leaving bird feces ...