Experts Discuss Kleptomania

Kleptomania (noun, “KLEP-tow-TRY-key”)

Kleptomania refers to the act of stealing hair from living mammals. Some bird species exhibit fur-gathering behavior to line their nests. The term derives from two Greek words: klepto (to steal) and trich (hair).

It has long been known that certain birds utilize fur to insulate their nests. Researchers have believed that birds collect hair shed by mammals in their environment. Mammals routinely shed fur, leaving behind stray hairs as they move. During seasonal molting, some mammals release fur in clumps, making it easier for birds to gather.

However, some birds don’t wait for the mammals to molt or hunt for deceased animals. Instead, they go right to the source and pluck fur directly from live mammals.

The birds most inclined to exhibit kleptomania belong to the avian family, which includes black-capped tits and great tits. These daring little birds circle around resting mammals to gauge their reaction. Once they confirm it’s safe, they proceed to collect fur.

Birds have been documented stealing hair from raccoons, foxes, livestock, and even humans. Often, mammals are asleep when birds approach. Yet, these feathered thieves sometimes act without waiting for nap time. One intrepid bird was seen tugging fur from a raccoon’s rear while the furry bandit was simultaneously collecting bird seeds. The raccoon occasionally swatted at the bird, but the tit managed to extract several mouthfuls of fur.

Kleptomania tends to be more prevalent in temperate climates where nighttime temperatures can be cold. It is seldom observed in tropical or subtropical regions. These geographic variations imply that fur may be instrumental in keeping eggs and chicks warm during the night, or perhaps the scent of the mammal serves to deter predators from attacking the nest.

In One Sentence

Black-capped tits and great tits steal fur from sleeping mammals, a behavior known as banditry.

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Source: www.snexplores.org