Natures wonders: animal hair stolen for bird's nests (Introduction)

by David Turell , Friday, August 13, 2021, 18:42 (986 days ago) @ David Turell

A common event:

https://www.sciencenews.org/article/birds-steal-animal-hair-fur-nest-new-word-video

"Some tiny birds take bold risks to gather a beakful of hair for their nests. Titmice have been spotted dive-bombing cats, alighting on dozing predators’ backs and plucking strands of hair from people’s heads. Now, there’s a term for the unusual behavior: kleptotrichy.

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“'Citizen scientists, bird watchers and people with dogs knew this behavior much more than the scientists themselves,” says animal behaviorist Mark Hauber of the University of Illinois at Urbana-Champaign. “Popular observations precede science rather than the other way around, which is a valid way to do science.”

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"In South America, palm swifts snatch feathers from flying pigeons and parrots — a behavior already known as kleptoptily. Searching through the scientific literature, Hauber, Pollock and colleagues found only 11 anecdotes of birds stealing hair from live mammals. While most published accounts involve titmice in North America, at least five other bird species get in on the action. Researchers have seen an American crow harvest hair from a cow and a red-winged starling in Africa peck a small antelope called a klipspringer. In Australia, three honeyeater bird species steal fur from koalas.

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"Scientists generally assume that birds gather hair for their nests in low-risk ways, relying on carcasses or stray fluff shed into the wind. “Plucking hairs from raccoons, which are common avian nest predators, suggests that it’s obviously worth it to get that hair,” Pollock says.

"Hair-harvesting species tend to live in colder climates, so those birds probably prize hair’s insulating properties, the team says. Some birds might also spruce up their nests with mammal hair to confuse would-be predators and parasites."

Comment: The last thought is pure Darwinism, having birds conceptualize.