Considerations on reproduction in birds

Abstract

The authors deal with the reproductive habits of birds, illustrated with Argentine species, when it is possible, and with birds of other countries, selecting their examples from books of a general character and of easy access to the reading public. The habits studied are: copulation, laying and incubation. In the case of copulation, monogamy, polygamy and promiscousness are considered. In the case of laying, the effect of a change from one hemisphere to another on the data of laying and the shortness or length of the laying period; lastly, under the heading of incubation, possible variation relating to laying, parental participation of the sexes in nest sitting and different types of incubation, solitary or collective are studied.