BirdNote Daily

The Pine Warbler is one of the few warblers that make appearances at bird feeders. They live year round in pine forests of the southeast U.S. and several Caribbean islands. Early spring is a good time to see them migrating through cities in the Midwest and the East Coast. If there’s a pine or two nearby, look for them picking through pine needles for food. Their song, heard throughout the year, is a sweet-sounding trill. Learn more at BirdNote.org.

When Great Horned Owl eggs hatch, the downy owlets are the size of newborn chickens. Their mother broods them day and night. A few weeks later, the owlets can be left alone while both adults resume hunting at twilight. Great Horned Owl young remain in the nest for about six weeks, then climb out onto nearby branches. They begin taking short flights at seven weeks, and can fly well at 9-10 weeks. Learn more at BirdNote.org.

The White-tailed Hawk thrives in the grassy plains of the Texas Coastal Plain, where many tropical species reach the northern limit of their ranges. White-tailed Hawks often hunt by kiting: hovering like a kite in the breeze with the wings held in a “V” above the body, dropping suddenly on their prey. When a grass fire breaks out, they hunt small animals fleeing from the fire’s edge. Learn more at BirdNote.org.

Tree Swallows and bluebirds — like this Western Bluebird — are among the earliest northbound migrants to arrive, heralding spring a month before the equinox. These species will nest only in cavities, such as old woodpecker holes or man-made nestboxes. But the supply of specialized nest sites is limited, and competition is intense. By arriving early, these swallows and bluebirds improve their chances of securing unoccupied cavities. To learn more about building nestboxes, visit BirdNote.org.

With a graceful leap, wings outstretched, Sandhill Cranes welcome the longer days. The stately cranes are courting, renewing an annual dance they perform in earnest as the days lengthen into spring. Sandhill Crane pairs remain together for life, and their spirited dance plays an essential role in reaffirming this bond. Learn more at BirdNote.org.

The harsh caws of American Crows are one of the most familiar bird calls in North America. Fish Crows sometimes join flocks of American Crows as they forage for food. The two crow species look similar, but have a distinct call that sounds a bit like an American Crow with a stuffy nose. The Fish Crow is found in much of the eastern U.S. and is spreading to new areas north and west to breed. Learn more at BirdNote.org.

Rodney Stotts is a master falconer who teaches people of all ages about raptors. In the 1990s, he helped reintroduce eagles to the Anacostia River, which runs through Washington, DC. As part of the Earth Conservation Corps, Rodney helped take care of eagle chicks sent from Wisconsin, where the species was more plentiful. Now, Bald Eagles consistently nest along the river, meaning that people living nearby can enjoy them. Learn more at BirdNote.org.

Bats and birds have evolved very different ways of flying. Birds have stiff feathers projecting from lightweight, fused arm and hand bones; bats have flexible wings of membranes stretched between elongated fingers. While birds use the strong downstroke of their wings to fly, bats support their weight on the upstroke, too, by twisting their wings backward. Bats tend to be more agile in flight, while many birds can fly with greater speed. Learn more at BirdNote.org.

In winter, a foraging flock might include several species of birds: chickadees, kinglets, and even a Downy Woodpecker. Many bird species eat alone, so you might wonder why these birds have chosen to dine together. Different species foraging in a group to find food enhances the success of all. One species assists the foraging of others. It's known as "commensal feeding." And more eyes and ears help protect the flock, too. Learn more at BirdNote.org.

Gentoo Penguins are the fastest penguins in the world. A group of researchers used the penguin’s streamlined shape to design a new undersea robot called the Quadroin. This robo-penguin has sensors to measure ocean conditions and currents. It’s particularly suited to studying eddies, which are smaller and short-lived than major ocean currents but help draw nutrients to the ocean surface, supporting the marine food web. Learn more at BirdNote.org.