BirdNote Daily

Crane Hawks of Central and South America and African Harrier-Hawks both have legs that bend forward and backward. Each bird’s wonderfully peculiar leg adaptation is completely original - it evolved all on its own - even though the end result is the same. Scientists call this convergent evolution.

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That’s not a distant dog barking. It’s a Black Skimmer in flight, at the Chincoteague National Wildlife Refuge in Virginia. This striking, black-and-white bird with a red bill and red feet has a most unusual way of feeding. It flies low along the surface of the water with its beak open. Closely related to terns, skimmers nest on sand islands in closely packed colonies. They depend on undisturbed islands and abundant small fish in coastal lagoons for their survival.

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Organized by the Cornell Lab of Ornithology, Project NestWatch is made up of volunteers around the world who monitor bird nests, reporting whether the birds successfully raise their young. Joining the project involves a bit of online training, finding a nearby bird nest, and briefly checking on it every 3-4 days without disturbing the birds.

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When smaller birds join forces to ward off larger birds, it's called mobbing. This behavior — like calling your family for help — is used by many bird species. The best time to observe mobbing is spring and early summer, when breeding birds are trying to protect their nests and young. Birds including swallows, blackbirds, and even these American Crows, seen here mobbing a Red-tailed Hawk, know that there is strength and power in numbers. And they've learned to join forces to protect themselves.

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While most Sandhill Cranes migrate, the Mississippi population lives year-round in wet pine savanna near the Gulf Coast. Their dependence on this unique habitat caused their population to plummet to just 35 when the savanna began to disappear. Through the Endangered Species Act, an almost 20,000- acre wildlife refuge was established for the cranes and the population has begun to recover.

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Birds at a suet feeder... What a burst of vitality on a chilly morning! What's the attraction? A cake of suet, suspended from a branch in a small wire feeder. Suet is beef fat, a high-energy food critical for birds' survival in the colder months. Suet is an especially strong magnet for birds (including this Northern Flicker) that eat lots of bugs in the warmer months. You can learn about suet feeders -- and what kinds of birds they'll attract -- at Birds.Cornell.Edu.

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The Puerto Rican Tody is a tiny green bird found only in Puerto Rico, where the species is called San Pedrito. But the scientific name for these birds is Todus mexicanus, despite the fact that they don’t live in Mexico — due to a mistake made by European scientists in the 1800s. People in Puerto Rico are working to get the San Pedrito an appropriate scientific name.

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It’s winter in North America — a good time to head for the subtropical realms of South Florida and listen to the region’s birds, such as the secretive Mangrove Cuckoo pictured here. Rarely seen, it sings sporadically in winter. When it does, you’re sure to take notice. A sweeter voice belongs to the Spot-breasted Oriole. Found in suburban neighborhoods, these birds were brought to Florida in the 1940s from Central America. And we can’t forget the sharp-edged phrases of the White-eyed Vireo or the eerie cries of the Limpkin.

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House Finches are evolving rapidly and visibly. In 1941, some captive House Finches from California escaped near NYC. They spread rapidly and are now found across most of the US. We know the finches have evolved, because those that survive differ from their parents. Size is one example. Male House Finches in recently established populations are larger than the males that escaped. Females have become smaller and survive better than larger females as nestlings. Evolutionary changes are occurring visibly all around us.

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An organization called Journey North consists of a network of community scientists who observe local animal migrations – everything from monarch butterflies to Gray Whales to birds. Observing these seasonal changes can help make you a well-rounded community scientist, attuned to life’s ebbs and flows. And the info collected by Journey North helps build a picture of how wildlife is responding to changes in habitat and the climate.

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