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Feather holes often characteristically occur on wing and tail feathers of some small-bodied species of passerines. In the case of barn swallows , it was suggested that the holes were feeding traces of avian lice , either Machaerilaemus malleus and/or Myrsidea rustica (both Phthiraptera : Amblycera ).
Feather holes are chewing traces of lice (most probably Brueelia spp. lice) on the wing and tail feathers. They were described on barn swallows , and because of easy countability, many evolutionary, ecological, and behavioral publications use them to quantify the intensity of infestation.
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Barn swallows (and other small passerines) often have characteristic feather holes on their wing and tail feathers. These holes were suggested as being caused by avian lice such as Machaerilaemus malleus and Myrsidea rustica, although other studies suggest that they are mainly caused by species of Brueelia.
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A number of holes are then cut or drilled into the stone face along the scored line approximately 10 to 20 centimetres (3.9 to 7.9 in) apart. Plug and feather sets are inserted in the holes, with the "ears" of the feathers facing the direction of the desired split. The plugs are then struck with a hammer in sequence.
addled eggs Also, wind eggs; hypanema. [5] Eggs that are not viable and will not hatch. [6] See related: overbrooding. afterfeather Any structure projecting from the shaft of the feather at the rim of the superior umbilicus (at the base of the vanes), but typically a small area of downy barbs growing in rows or as tufts.
House sparrow, Passer domesticus. The following outline is provided as an overview of and topical guide to birds: . Birds (class Aves) – winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals.