BirdNote Daily

Sandgrouse live in some of the most parched environments on earth. To satisfy the thirst of their chicks, male sandgrouse carry water back to the nest in a surprising but effective way: by carrying it in their feathers. Thanks to coiled hairlike extensions on the feathers of the underparts, a sandgrouse such as this Burchell's Sandgrouse can soak up and transport about two tablespoons of liquid. The sandgrouse chicks use their bills like tiny squeegees, “milking” their father’s belly feathers for the water they need.

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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.

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In this episode, we meet Aviary: the superhero alter-ego of a mild-mannered birder bitten by a radioactive feather mite. Aviary became able to shapeshift into any of the birds they've seen in their travels — taking on the ultra-fast flight of a falcon or the super-swimming skills of a penguin. Aviary soon realized they’d have to use their powers for good when something seemed off with the local owls one night.

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Most swallow species that nest in North America eat almost nothing except flying insects. When the bugs die off in the fall, the swallows head south to winter in the tropical zones of Central and South America and the Caribbean. However, Tree Swallows can also eat small fruits. If Tree Swallows arrive in the north before the insects are out, they’ll supplement their diets with fruit, giving them a competitive advantage for limited nesting sites.

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John Zaktansky leads the Middle Susquehanna Riverkeeper Association, which is using recording devices to identify birds by sound on different parts of the Susquehanna River in Pennsylvania. John’s hope is that the birds ID’d by these recorders can help create a health report for the river as an early warning system for toxic pollutants, contaminants and other threats.

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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.

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Before chimneys existed, Chimney Swifts relied on old hollow trees for nesting and roosting. They can’t perch, they can only cling to a rough vertical surface. As developers cleared old growth forests, Chimney Swifts began using human-built structures. But building styles have changed, making traditional brick chimneys rarer. Pesticides have reduced the populations of swifts’ insect prey. People can help swifts by leaving brick or stone chimneys open from April to October and avoiding pesticides.

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Does the image of a frozen birdbath bring to mind a small yellow bird with ice skates? Birds need water in all seasons, for drinking and for bathing. When the water is frozen, you can thaw it with hot water. Or go the slightly more expensive route and add a heater.

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Before we see or feel spring, we often hear it first — in the testimony of a Red-winged Blackbird, the energy of a Song Sparrow, or the serenade of an American Robin. But across much of North America, an earlier sign of spring is the return of Turkey Vultures. In the U.S., you may see them as early as February or March. Unlike most of our returning birds, which migrate at night, Turkey Vultures migrate like hawks — in the daytime. They rise on warm spring updrafts, with a distinctive teeter from side to side. And then they glide — northbound.

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For years, nature recordist Lang Elliott came up with clever ways to hear high-pitched bird songs despite his high-frequency hearing loss. Lang teamed up with a programmer to develop an app called Hear Birds Again. Currently it’s only available for iPhones, but it’s able to take high-pitch bird songs and shift them down into a lower range.

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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.

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Dr. Clinton Francis is a sensory ecologist who studies how noise pollution affects birds, like this Black-headed Grosbeak. He says sounds from machines and vehicles can really disrupt bird behavior. Although birds rely on hearing to sense predators and prey, and to find mates, their sense of hearing isn’t very good, making them very sensitive to noise pollution from machines and vehicles. Fortunately, there are many ways to help birds by reducing noise pollution.

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When Day Scott teaches people how to take pictures of birds, she emphasizes observing birds carefully before picking up the camera. Sometimes that means choosing whether or not to even attempt a photo. In this episode, Day shares a story about choosing whether or not to try and photograph a rare Painted Bunting in her area or to see the bird in high-definition through her binoculars.

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Some plants have evolved fruits with edible flesh that attract birds. When birds swallow the fruit, they also ingest the seeds. They transport the seeds to new spots for the plants to take root. Birds’ digestive systems grind away the hard outer coating of the seed, making it more likely to germinate. Seeds in a bird’s droppings are pre-packaged in nutrient-rich fertilizer.

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Hummingbirds are built for hovering flight, with flexible wrists that rotate their wings in a rapid figure-eight motion that generates almost constant lift. Eurasian Skylarks, on the other hand, hovers by fluttering its wings 10-12 times per second, singing all the while. Some raptors such as American Kestrels use a different strategy: by flying into the wind, they can float in place while they scan for prey.

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In the 1990s, train engineers in Japan built trains able to travel nearly 170 miles per hour. The problem was that when the trains exited a tunnel, the air in front of their bullet-shaped noses expanded rapidly, creating a loud “tunnel boom.” The chief engineer, a birder, looked to the shape of a kingfisher’s bill to design long, narrow train noses that parted the air. The trains became both quieter and more efficient.

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While many shorebirds have gone south, tiny sandpipers called Sanderlings are easy to find on winter shores. They follow the waves as they lap in and out, probing the swirling sand for prey. They often eat various small crustaceans such as mole crabs, isopods, and amphipods. But they also enjoy miniature clams, polychaete worms, and horseshoe crab eggs. They’ll even catch flying insects or eat plant matter.

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Artist Debra Ramsay became fascinated with the way that birds and their colors mark changes in the seasons. In her “Migrations” project, she painted species seen in New York’s Central Park, creating an abstract design from the three main colors of each bird. Debra layered colors into thick plexiglass panels, so the paintings appear to change when seen from different angles.

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Tennessee Warblers love drinking nectar, but they do it without helping to pollinate flowers. By tapping a hole into the base of a flower, these warblers enjoy an easy meal while bypassing the flower’s pollen. But they give back to their ecosystems in other ways – such as eating countless insects!

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When the shorebirds called Lesser Yellowlegs sense a threat to their nest, they’ll put up an unforgettable racket to drive the danger away. Smaller and with a shorter bill than the Greater Yellowlegs, Lesser Yellowlegs sing to attract mates, while flying or perching up in a tree like a songbird. Although they’re widespread, Lesser Yellowlegs have lost over half their numbers in the last 50 years. Protecting wetlands, addressing climate change, and using sustainable farming practices can all help make sure that this species stays common, loud and proud throughout the Americas.

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