BirdNote Daily

We've all heard that the early bird gets the worm. But research shows that birds dining early and heavily may lower their life expectancy. Socially dominant birds stay lean (and agile at avoiding predators) during the day, and then stoke up later, before a cold night. Subordinate birds have to look for food whenever and wherever they can find it, and carry fat on their bodies to hedge against unpredictable rations.

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The ancient Greeks and Egyptians described a mythical bird called the Phoenix, a magnificent creature that was a symbol of renewal and rebirth. According to legend, each Phoenix lived for 500 years, and only one Phoenix lived at a time. Just before its time was up, the Phoenix built a nest and set itself on fire. Then, a new Phoenix would rise from the ashes.

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Although a field of grass might not seem like valuable habitat at first, many birds have adapted to nest in grassland habitats and nowhere else. In North America, birds such as the Bobolink seek out grasslands to raise their young, deftly hiding their nests within the dense vegetation. Very few grasslands and savannas have been protected compared to the area that’s been lost, making them the most at-risk ecosystem on the planet. That means every acre of grassland remaining is even more precious — to birds, to plants, and to people.

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There may be no busier bird during the nesting season than a male House Wren. Just a day or so after completing his spring migration from the tropics, the male House Wren claims a territory and checks out several potential nest cavities. And in each of these locations, he builds a starter nest using virtually anything twig-like to get the job done — from nails and bits of wire to paper clips and hairpins. The male House Wren stays at it until a female pairs with him. Then she picks one of the starter nests and takes over construction. 

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You might think the first bird species that humans raised in captivity would be a relatively small one, like a chicken. But evidence suggests that people in New Guinea reared the cassowary, often called the world’s deadliest bird, as much as 18,000 years ago, long before the domestication of chickens. The remains of cassowary eggs and bones at archaeological sites in New Guinea indicate that people gathered the eggs, possibly allowing the more mature eggs to hatch into chicks.

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Each spring, millions of birds head north. From Ecuador, beautiful Scarlet Tanagers fly to the eastern US and Canada, many traversing the Gulf of Mexico, an arduous journey. Across much of southern Europe, Common Nightingales – small thrushes with russet feathers – are arriving, having traveled northward from Africa across immense deserts. In northern Asia, petite songbirds known as Siberian Rubythroats — like this one — are arriving en masse, some winging their way across the South China Sea from the Philippines, others over the mountains from Thailand.

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Great-tailed Grackles live up to their name. The glossy black males trail their long, V-shaped tails behind them as they fly, almost like a plane towing a banner ad. And while not quite as flashy, the brown-feathered females have impressively long tails, too. Also known as the Mexican Grackle, this species lives in all sorts of habitats from the northern coasts of South America to the western U.S. Their ability to live in both cities and farmland has helped Great-tailed Grackles expand as far north as Iowa.
 

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One of the most musical and complex bird songs in the US is that of the Brewer's Sparrow. It's a veritable aria, ringing forth from the sagebrush of Eastern Washington's Columbia Basin. Shrub-steppe is disappearing from the interior west as it is cleared for irrigated crops. The quintessential drylands bird, the Brewer's Sparrow can survive for an extended period of time with no supplemental water, getting all the water it needs from seeds and arthropods.

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Female birds need to eat calcium to have enough of the mineral to lay their eggs. But it can be hard to find enough of it to eat in nature. We can help our backyard birds by offering them some extra calcium in bird feeders and by recycling our used egg shells.

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Ever heard the term “eagle eye”? An eagle’s vision is incredibly sharp, and its eyes can weigh more than its brain. The secret to the bird’s exceptional vision is the density of visual cells – the rods and cones – of its retina.

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