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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]
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 can, on average, provide enough food". [1]
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 .
Egg size tends to be proportional to the size of the adult bird, [citation needed] from the half gram egg of the bee hummingbird to the 1.5 kg egg of the ostrich. Kiwis have disproportionately large eggs, up to 20% of the female's body weight. [ 18 ]
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] In the wild, eggs are typically laid at 3 to 5 day intervals, with records in captivity of intervals of up to 7 or 10 days.
Northern screamer Conservation status Near Threatened (IUCN 3.1) Scientific classification Domain: Eukaryota Kingdom: Animalia Phylum: Chordata Class: Aves Order: Anseriformes Family: Anhimidae Genus: Chauna Species: C. chavaria Binomial name Chauna chavaria (Linnaeus, 1766) Distribution map Synonyms Parra chavaria Linnaeus, 1766 The northern screamer (Chauna chavaria) is a Near Threatened ...
In director Sarah Dowland’s “Sue Bird: In the Clutch,” that objectivity-questioning … ‘Sue Bird: In the Clutch’ Review: Adulatory Portrait of a WNBA Legend Takes the Softball Approach ...
Clutch size differs greatly between species, sometimes even within the same genus. It may also differ intraspecies due to many factors including habitat, health, nutrition, predation pressures and time of year. [106] Average clutch size ranges from one (as in northern gannet [107]) to about 17 (as in grey partridge [108]). A rooster with a ...