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In the behavior called anting, birds rub insects on their feathers, usually ants, which secrete liquids containing chemicals such as formic acid, that can act as an insecticide, miticide, fungicide, or bactericide. It possibly also supplements the bird's own preen oil. Instead of ants, birds can also use millipedes. Over 250 species of bird have been known to ant.
Some birds, including starlings, babblers, tanagers, blue jays, and weavers, ant actively; that is, they pick up ants with their beak and rub them over their feathers. There are also passive anters, who simply lie over anthills, such as the Eurasian Jay, crows and waxbills.
This behaviour was first described by Erwin Stresemann in German as einemsen in Ornithologische Monatsberichte XLIII. 138 in 1935. The Journal of Bombay Natural History Society XXXVIII described it in English in the following year and translated the term as "anting".
From Wikipedia
Some birds, including starlings, babblers, tanagers, blue jays, and weavers, ant actively; that is, they pick up ants with their beak and rub them over their feathers. There are also passive anters, who simply lie over anthills, such as the Eurasian Jay, crows and waxbills.
This behaviour was first described by Erwin Stresemann in German as einemsen in Ornithologische Monatsberichte XLIII. 138 in 1935. The Journal of Bombay Natural History Society XXXVIII described it in English in the following year and translated the term as "anting".
From Wikipedia
