...Both sexes incubate, one relieving the other at certain hourseach day...
Frank M. Chapman 「Color Key to North American Birds」
...Do not incubate...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...They will otherwise drop their eggs carelesslyhere and there, or incubate in places where their eggs will be sucked bycrows, and half their progeny destroyed by rats...
Robert Jennings 「Sheep, Swine, and Poultry」
...Insects, fishes, and reptiles lay eggs, and there are several rarespecies of mammals that lay eggs and incubate them...
John H. Robinson 「Our Domestic Birds」
...Turkeys and geese will often begin to incubate after havinglaid about the number of eggs that they could cover...
John H. Robinson 「Our Domestic Birds」
...Many fowls will dothe same, but most fowls lay for several months before attempting toincubate, and in many races not more than two or three per cent of thehens ever incubate...
John H. Robinson 「Our Domestic Birds」
...When a hen wants to incubate eggs, or, as the common phraseis, to sit, she remains on her nest continuously and, unless very shy,will not leave it when approached and will resent any interference...
John H. Robinson 「Our Domestic Birds」
...Because a hen pigeon often lays againand begins to incubate before a pair of young are ready to leave thenest, it is usual to arrange the pigeonholes in pairs...
John H. Robinson 「Our Domestic Birds」
...Both sexes take part in nestconstruction, but the hen alone appears to incubate...
Douglas Dewar 「A Bird Calendar for Northern India」
...In thesecases it has been affirmed that two or more females share a commonnursery, and incubate together...
Rev. C. A. Johns 「British Birds in their Haunts」
...There are also American cuckoos that buildtheir own nest and incubate their own eggs...
Frederick G. Aflalo 「Birds in the Calendar」
...She does nothing of the sort, preferring to roam from onefind to the other and to take from each the wherewithal to model asingle pellet, which is left to itself for the soil to incubate...
Jean Henri Fabre Alexander Teixeira de Mattos 「The Glow-Worm and Other Beetles」
...A female, whose mate was probably killed by me on June 15, continued to incubate the three eggs until they hatched on June 29, but deserted the nest when the young were two days old...
Glen E. Woolfenden 「Comparative Breeding Behavior of Ammospiza caudacuta and A. maritima」
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