| Feathers are, therefore, most reasonably interpreted as having evolved primarily in association with flight, rather than for thermoregulatory purposes. |
| Feathers also exhibit serial homology, in that the individual feathers are not distinguishable on any criterion. |
| Feathers are mostly distichous, hair-partings are distichous, the moustache is distichous. |
| Feathers and vanes work about equally well with less-powerful target crossbows. |
| Feathers of infested birds are discolored by mite excrement and eggs, and the skin is scabby. |
| Feathers which cover and help mould the shape of the bird are called tetrices. |
