. The birds of Illinois and Wisconsin . Jan., 1909. Birds of Illinois and Wisconsin — Cory. CTnder Primary^ CovertsJfnder Wing CoverU Carpnt —f _- 15. AxiUart or Axillary Plumes Under Surface of Wing. The Speculum. A term used to indicate a patch or band on thewing (usually of different color from the rest of the feathers), formedby the terminal portion of the secondaries, very noticeable in theDucks. (See illustration, page 12.) The Axillary Plumes, or Axillars, are an important aid in the iden-tification of many species; these are several rather elongated feathersgrowing from the armpit {axi

---

. The birds of Illinois and Wisconsin . Jan., 1909. Birds of Illinois and Wisconsin — Cory. CTnder Primary^ CovertsJfnder Wing CoverU Carpnt —f _- 15. AxiUart or Axillary Plumes Under Surface of Wing. The Speculum. A term used to indicate a patch or band on thewing (usually of different color from the rest of the feathers), formedby the terminal portion of the secondaries, very noticeable in theDucks. (See illustration, page 12.) The Axillary Plumes, or Axillars, are an important aid in the iden-tification of many species; these are several rather elongated feathersgrowing from the armpit {axilla), at the junction of the wing andbody. THE TAIL. The Rectices, or Tail Feathers, proper, number from 8 to 24, andin some very few cases even more. By far the greater number ofbirds, however, have 12 rectices. The small feathers overlappingthe rectices are called upper tail coverts, while those below are theunder tail coverts or crissum, although the latter term is often usedto include the region immediately about the vent.

---

Size: 3117px × 802px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bo, bookcentury1900, bookdecade1900, bookidbirdsofillinoisw00cory