BirdNote Daily

The secret to birds’ flight starts with the shape of their wings. They’re curved in a way that causes air to flow more slowly under the wing than above it. That creates an area of low pressure just above the wing that pulls the bird up into the sky—a force called lift. Airplane wings are curved in a similar way — but unlike airplanes, bird wings don’t stay in place, they flap! That lets birds push their way into the air from a dead stop. On the upstroke of a wing-flap, birds fold their wings inward, reducing drag on the wing.

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Palmyra Atoll is a ring-shaped island encircling a lagoon in the South Pacific. The atoll lost many native trees due to U.S. military activity during World War II. Conservationists have worked to restore the ecosystem. Seabirds such as Black Noddies and Red-footed Boobies nest in the island’s rainforest. Their guano enriches the soil, and the soil’s nutrients help support the coral ecosystem that provides fish for the birds.

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After Christine Okon was diagnosed with multiple sclerosis in 2012, she found herself falling behind on birding walks when the group trudged across hills and valleys – something she once really enjoyed. Now, Christine helps organize birding events with Golden Gate Bird Alliance and designs them to be accessible. A big part of that is talking to people with disabilities about what they need.

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The 22-inch Great Horned Owl has two tufts of feathers that stick up from the top of its head. This owl is difficult to see, but it's often heard during dark winter evenings and pre-dawn mornings. A pair of owls may call back and forth or overlap their hoots. The male’s call is slightly lower in pitch. Listen for the owl’s night-time refrain, "Who’s awake? Me, too."

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Kererū, green-blue pigeons native to New Zealand, like to sun themselves after dining on fruit. But in warm summer months, the bird’s sunbathing has a surprising side-effect. A part of their digestive system called the crop stores their latest snack – where it begins to ferment, eventually making the pigeons drunk! The rotund creatures often get so tipsy that they fall out of trees, prompting compassionate people to deliver them to local bird rescues and let them sober up.

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Nuthatches rank high on the list of favorite backyard birds. Compact and stub-tailed, they climb down tree trunks and along the underside of branches with comical ease. One at a time, they flit in for suet and sunflower seeds. But out in the woods, where they spend most of their time, nuthatches are hard to spot. Fortunately, they give themselves away with their voices. Compare the calls of Red-breasted and White-breasted Nuthatches, then head to the woods.

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Gentoo Penguins live in the frigid waters of the Atlantic. Only recently have scientists begun to unravel why penguin feathers don’t freeze. An electron microscope revealed tiny pores on the feathers that trap air, making the surface water repellent. This feature, plus a special coating oil from the preen gland, prevents water build-up and delays freezing. Engineers could attempt to apply these principles to prevent icing on plane wings.

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Driving down a country road in eastern Ontario, there’s a surprising sight by the roadside: dozens of vibrantly coloured, eclectic birdhouses sitting atop 12-foot poles. It’s called Birdhouse City, and it’s in a conservation area boasting close to 100 birdhouses, with 30 under renovation. The initial birdhouse designs were based on nearby historical buildings, from the general store to the courthouse. About a third of them are occupied, with several species reliably taking up residence.

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When Juan Pablo Culasso spends time outside, he often encounters people thinking he doesn’t belong out there as a blind person – despite the fact that he’s a renowned nature recordist. He helped design nature trails in Colombia with features that make them more accessible for people who are visually impaired, including guide ropes with textures that signal points of interest and QR codes that provide info. But Juan Pablo says these are not simply trails solely for blind people to enjoy — “we need to share the same places in society,” he says.

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Trumpeter Swans land in a plowed field to forage for remnant potatoes, grain, and other waste crops. This swan is among the largest of all waterfowl; the Tundra Swan is somewhat smaller. These swans migrate in family groups each fall from nesting sites in Canada and Alaska. Learn more about these swans, and view a map to the Skagit Flats of Washington where you can see them. When you go, please be courteous, and if you stop, pull completely off the roadway. Always respect private property. More info at Northwest Swan Conservation Association and The Trumpeter Swan Society!

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