Birds' Nests
نویسندگان
چکیده
منابع مشابه
The design and function of birds' nests
All birds construct nests in which to lay eggs and/or raise offspring. Traditionally, it was thought that natural selection and the requirement to minimize the risk of predation determined the design of completed nests. However, it is becoming increasingly apparent that sexual selection also influences nest design. This is an important development as while species such as bowerbirds build struc...
متن کاملLivestock grazing and trampling of birds’ nests: an experiment using artificial nests
The purpose of this study is to experimentally determine the differences between four grazing treatments on the trampling of nests. Additionally, we examine to what extent the trampling probability of nests is higher close to a source of fresh water. We compare the trampling of artificial nests in five different grazing treatments in an experimental design. We use buried clay pigeon targets as ...
متن کاملResponses of Birds to Broken Eggs in Their Nests’
We tested the responses of two bird species which nest on unmovable substrates (e.g., cavities and walls) to simulated and actual egg damage in their nest. Tree Swallows (Tachvcineta bicolor) and Barn Swallows (Hit-undo ruiticaj removed broken eggs and continued to incubate the rest of their clutch, but rcsponse times took up to 8 days, and observed rejection rates were lower than reported for ...
متن کاملThe Isolation and the Nature of the Amino Sugar of Chinese Edible Birds’ Nests.*
Although many attempts have been made by different investigators to isolate the carbohydrate group from various glycoproteins, only two amino sugars have so far been isolated: chitosamine (glucosamine) and chondrosamine. Chitosamine (1) was first isolated from lobster shells and later from other substances. In some cases the hydrochloride of chitosamine was obtained in crystalline form while in...
متن کاملCooperative investment in public goods is kin directed in communal nests of social birds
The tragedy of the commons predicts social collapse when public goods are jointly exploited by individuals attempting to maximize their fitness at the expense of other social group members. However, animal societies have evolved many times despite this vulnerability to exploitation by selfish individuals. Kin selection offers a solution to this social dilemma, but in large social groups mean re...
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ژورنال
عنوان ژورنال: Nature
سال: 1870
ISSN: 0028-0836,1476-4687
DOI: 10.1038/002189b0