BirdNote Daily

The stars appear to rotate in the sky, raising the question of how birds can use stars to navigate during migration. Ornithologist Stephen Emlen brought Indigo Buntings to a planetarium, tracking their movements as the simulated night sky changed above them. The buntings oriented themselves using star patterns that appear to rotate the least — especially the North Star, Ursa Major and Cassiopeia.

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Found throughout North America, the common sunflower can grow up to ten feet high, towering over other herbs and grasses. And that’s only half the story: their roots can reach just as deep in the soil. They’re rugged, adaptable plants that bring beauty — and food — to the ecosystem. Planting sunflowers in a public green space or a backyard can benefit pollinator insects as well as finches and other birds that seek out their seeds, which often last well into the winter.

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Ranging from metallic hisses to electronic yodels, sounds of grackles may not be music to our ears—but they have their own rough beauty, a distinctive, primal harshness. Grackle songs evolved to carry through their nesting habitats — dense marshes and brushy landscapes — where more lyrical notes and phrases wouldn’t carry well. However strange they may sound, they know how to make themselves heard.

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Before the high-tech gadgets used to track bird migration today, there was moon-watching: a technique dreamed up in the 1940s by ornithologist George Lowery. Using telescopes pointed at the moon to see the silhouettes of migratory birds, Lowery helped show that birds regularly migrate across the Gulf of Mexico and organized the first continent-wide survey of migration in North America. Learn more about the history of bird migration research in Rebecca Heisman’s new book Flight Paths: How a Passionate and Quirky Group of Pioneering Scientists Solved the Mystery of Bird Migration.

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To distinguish one bird from a similar one, watch how the bird moves. Does it flick its wings? Bob up and down? Flip its tail? The White-breasted Nuthatch (right) works its way down the trunk of a tree, while the Brown Creeper works its way up. A field guide usually mentions these behaviors, and watching for them can help you determine which bird is which. It's like detective work: gather enough clues, and you'll solve the mystery!

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By late summer, most birds hatched in spring are on their own, without help from their parents. Where do they go? Young migratory birds will head south in late summer or fall, in the pattern of their species. But most non-migratory birds born last spring — such as this immature Bewick’s Wren — will need to find an unoccupied territory. So they disperse more widely than the established adults. Newly fledged Bald Eagles embark on a nomadic life. Sometimes they fly hundreds of miles in a day, a journey that may take them across the continent. 

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Found in the Sierra Madre, the Arizona Woodpecker has a special connection to the mountain range. Sharing mid-elevation pine and oaks with fellow border straddlers, these small brown birds with white and brown cheeks stand out from other Woodpeckers with their heavily marked white underparts. Uniquely, they forage by flying to the base of a tree and then spiraling up the trunk. And in courtship, the male turns himself into a paper airplane, holding his wings steady and gliding toward his mate.

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It’s been said that if someone knows only three birds, one of them will be the crow. They’re common, easy to see, and even easier to hear. But crow voices are complicated. Altogether, crows may use 30 sound elements in different combinations, and one of the most intriguing is their song. Unlike many birds, crows don’t sing loudly to attract mates from a distance. Instead, they sing softly — and at close range — during courtship, with a mix of soft cooing, rattles, growls, bowing movements, and mutual nuzzling.

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Nature educator Johanne Ryan shares her observations of Southern Lapwings, shorebirds that make their nests on the ground in open areas and vigorously defend them. If a potential predator approaches, the parent will sound a piercing alarm call. If that doesn’t work, the lapwing will charge the opponent, using a secret weapon – sharp, bony spurs on the bird’s “wrists.”

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When birds like these Dunlin form flocks, each individual is less likely to be captured by a predator. Some shorebirds that forage with their heads down, like godwits, will flock with birds that forage with their heads up, like curlews. Still other birds work together —  like American White Pelicans driving fish before them or auklets that surround schools of herring and herd them like a border collie does sheep.

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