The Codex on the Flight of Birds

Quotes:
"As suggested by the name, this manuscript deals primarily with the flight of birds, which Leonardo analysed closely in his efforts to build a mechanical flying machine. Here the mechanics of flight, air resistance and the effects of wind on the wings and flight of birds are all considered in great detail.

This codex consists of 13 pages out of an original 18 and was originally part of Manuscript B."

-Universal Leonardo

"Codex on the Flight of Birds is a relatively short codex of circa 1505 by Leonardo da Vinci. It comprises 18 folios and measures 21 × 15 centimetres. The codex begins with an examination of the flight behavior of birds and proposes mechanisms for flight by machines."

-Wikipedia, Codex on the Flight of Birds

Definition:
This document was written in conjunction with Leonardo's efforts on obtaining flight. It studies the natural flight patterns of birds and other "natural" fliers such as bats and kites.

Related:

 * Paris Manuscript B
 * Ms B Fol 74v-75r
 * Leonardo da Vinci
 * Principles of Flight
 * Fly Like a Bird, Sink Like a Stone
 * Flights of Fancy, Glider Activity