Covert feather

A covert feather or tectrix on a bird is one of a set of feathers, called coverts (or tectrices), which, as the name implies, cover other feathers. The coverts help to smooth airflow over the wings and tail.

Topside of a chicken wing showing all major feather groups

Ear coverts

The ear coverts are small feathers behind the bird's eye which cover the ear opening (the ear of a bird has no external features)

Tail coverts
A rear view of an Indian peacock's true tail and elongated uppertail covert feathers

The uppertail and undertail coverts cover the base of the tail feathers above and below. Sometimes these coverts are more specialised. The "tail" of a peacock is made of very elongated uppertail coverts.

Wing coverts

The upperwing coverts fall into two groups: those on the inner wing, which overlay the secondary flight feathers, known as the secondary coverts, and those on the outerwing, which overlay the primary flight feathers, the primary coverts. Within each group, the feathers form a number of rows. The feathers of the outermost, largest, row are termed greater (primary-/secondary-) coverts; those in the next row are the median (primary-/secondary-) coverts, and any remaining rows are termed lesser (primary-/secondary-) coverts. The underwing has corresponding sets of coverts (the names upperwing coverts and underwing coverts are used to distinguish the corresponding sets). In addition, the front edge of the wing is covered with a group of feathers called the marginal coverts. Within each group of wing coverts, the rows of feathers overlap each other like roof tiles (the greater coverts are overlain by the median coverts, which in turn are overlain by the outermost row of lesser coverts, and so on).

gollark: You could just randomize the tax brackets every year, could be fun.
gollark: HOW theoretically?
gollark: I checked on the internet™ and apparently the bottom 50% don't contribute very much to tax, presumably because they're already quite slanted that way.
gollark: Hmm, I checked and apparently it seems like you may in fact be able to move the curves substantially rightward without impacting tax income very much.
gollark: They can move somewhere else, however.

See also

References
  • Mullarney, Killian; Svensson, Lars; Zetterstrom, Dan; Grant, Peter (1999). Collins Bird Guide. London: HarperCollins. ISBN 0-00-219728-6.
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