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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]
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.
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 ]
Average clutch size is five to seven eggs. [19] Unlike many birds, the offspring of tufted titmice will often stay with their parents during the winter and even after the first year of their life. [20] Sometimes, a bird born the year before will help its parents raise the next year's young. [21]
The "bird test" is going viral on TikTok as a way to assess the health and longevity of a relationship. But the driving theory behind the test isn't new — it's backed by research from one of the ...
Clutch Size − The number of eggs laid by a female bird (clutch size) is typically under stabilizing selection. This is because the female must lay as many eggs as possible to maximize the number of offspring. However, they can only lay as many eggs as they can support with their own resources.
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 ...