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A sea turtle clutch. A clutch of eggs is the group of eggs produced by birds, amphibians, or reptiles, often at a single time, particularly those laid in a nest. In birds, destruction of a clutch by predators (or removal by humans, for example the California condor breeding program) results in double-clutching. The technique is used to double ...
Avian clutch size should be proportional to breeding season resource productivity per breeding pair of birds. [10] This relationship has been found in a series of studies from Alaska and Costa Rica. [10] According to Ashmole's Hypothesis, the clutch size of resident birds is proportional to the level of competition with migrant birds. [11]
Bird ringing is the term used in the UK and in some other parts of Europe, while the term bird banding is more often used in the U.S. and Australia. [49] bird strike The impact of a bird or birds with an airplane in flight. [50] body down The layer of small, fluffy down feathers that lie underneath the outer contour feathers on a bird's body. [51]
If there are too many mouths to feed, fewer young will survive, reducing the parents' reproductive fitness. Lack's principle , proposed by the British ornithologist David Lack in 1954, states that "the clutch size of each species of bird has been adapted by natural selection to correspond with the largest number of young for which the parents ...
A mean of 48 clutches from Algeria and Tunisia showed an average of 1.89 eggs per nests, with a range of 1 to 3. [49] The female laid an average number of eggs of 1.99 in 332 clutches from 8 studies in 5 of the Western United States. The largest mean clutch size across the range was 2.1 in Montana. [53]
Blue jays can be very aggressive to other birds; they sometimes raid nests and have even been found to have decapitated other birds. [3] It builds an open cup nest in the branches of a tree; both sexes participate. The clutch may be two to seven eggs, which are blueish or light brown with darker brown spots.
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In comparison, a group of eggs and the offspring that hatch from them are frequently called a clutch, while young birds are often called a brood. Animals from the same litter are referred to as littermates.