Search results
Results from the WOW.Com Content Network
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 clutch size is influenced by latitude, with clutch sizes of northern populations being higher on average than southern populations. [69] The eggs are 20 mm × 14 mm ( 3 ⁄ 4 in × 1 ⁄ 2 in) in size, and weigh 1.9 grams (29 grains), of which 5% is shell.
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 ...
However, the average clutch size is 26 eggs laid by 7 different females. [4] Rhea eggs measure about 130 mm × 90 mm (5.1 in × 3.5 in) and weigh 600 g (21 oz) on average; they are thus less than half the size of an ostrich egg. Their shell is greenish-yellow when fresh but soon fades to dull cream when exposed to light.
Pairs sometimes nest in the same tree with other rainbow lorikeet pairs, or other bird species. [27] The clutch size is between one and three eggs, which are incubated for around 25 days. [20] Incubation duties are carried out by the female alone. [24] Rainbow lorikeets are mostly monogamous and remain paired for long periods, if not for life. [29]
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 ...
Average clutch size in the region almost doubled. In 1973 the program was expanded to four traps, which caught 3,300 cowbirds and resulted in no parasitism that year. That same year 216 singing male warblers were recorded an increase of 9.2% from the 200 males recorded in 1972, and the first increase recorded ever.