Si las plumas de un ave se secan demasiado, se vuelven frágiles. Para evitarlo, la mayoría de las aves tienen una glándula situada encima de la base de la cola que produce un aceite. Usan sus picos para masajear el aceite desde la glándula hacia las plumas, para mantenerlas flexibles. Un…

In June 1853, Thoreau wrote of an enchanting encounter with the Wood Thrush: "This is the only bird whose note affects me like music. It lifts and exhilarates me. It is inspiring. It changes all hours to an eternal morning." Wood Thrushes thrive in large expanses of forest. And their…

European Starlings were present in great numbers in ancient Rome. They swarmed in massive flocks or murmurations — thousands of individuals cascading and folding in awe-inspiring geometric patterns in the sky. Roman augurs, or diviners, scrutinized these patterns for signs of how the gods…

In 1956, the Eisenhower Administration announced plans for the nation’s new interstate highway system. Planners foresaw 41,000 miles of superior highways, with a grassy border on either side and down the middle. The grassy areas created ribbons of wildlife habitat occupied by small mammals…

In summer, many shrubs bear fruit that birds find irresistible. Elderberries, serviceberries, blackberries, dogwood berries, mulberries, and currants attract many species of birds, including waxwings, tanagers, robins, warblers and this Rose-breasted Grosbeak. Plants offer this bounty in…

In the desert Southwest, water can be scarce. Yet some birds, like this Black-throated Sparrow, thrive in a scorching landscape. The birds obtain moisture from foods like nectar and fruit, as well as insects and other prey. They tuck into the shade in the heat of the day, so they won’t…

On a hot summer’s day, watch a bird such as a crow — or this Bald Eagle — very carefully. You’ll never see them sweat, because birds don’t have sweat glands. So how do they keep cool? One way is panting. As the bird breathes rapidly, heat is carried out of its body through the lungs and…

The Tower of London has a long and notorious history of murderous political intrigue, dungeons, and famous beheadings. And for more than 300 years, the tower has also been home to a set of royally maintained ravens. Since the time of Charles II, at least six ravens have — by royal decree —…

Burrowing Parakeets excavate deep nest tunnels in sandstone and limestone cliffs in Argentina and Chile. The colony’s many tunnels zigzag and interconnect, creating an intricate labyrinth. Their nesting colonies are among the largest of any parrot — one in Argentina has 70,000 birds!…

Most birds possess the ability to see color. But birds can also see in the ultraviolet spectrum! Hummingbirds — like this Violet-crowned Hummingbird — may zero in on certain flowers because their petals strongly reflect in the ultraviolet range. Migrating birds may use ultraviolet light to…