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A new paper in the journal Ecology documents this phenomenon, which the authors call “kleptotrichy,” from the Greek roots for “theft” and “hair.” The authors found only a few descriptions of the behavior in the scientific literature but came up with dozens more examples in online videos posted by birders and other bird enthusiasts. In almost all the videorecorded cases, the thief is a titmouse plucking hair from a cat, dog, human, raccoon or, in one case, porcupine.
Many species of titmice, chickadees and tits – all members of the family
Paridae – are known to use hair or fur to line their nests, said Mark Hauber, a professor of evolution, ecology and behavior at the University of Illinois Urbana-Champaign who led the write-up with postdoctoral researcher Henry Pollock. The hair’s role in the nest is still debated, although it is more commonly used by birds nesting in temperate climates, so maintaining warmth in the nest is thought to be one advantage.
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