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A number of factors determine how quickly any changes may occur in a species, but there is not always a desire to improve a species from its wild form. Domestication is a gradual process, so there is no precise moment in the history of a given species when it can be considered to have become fully domesticated.
It can be an energetically demanding process, with adult albatrosses losing as much as 83 g of body weight a day. [6] Megapode eggs take from 49 to 90 days depending on the mound and ambient temperature. Even in other birds, ambient temperatures can lead to variation in incubation period. [7] Normally the egg is incubated outside the body.
Domestication has been defined as "a sustained multi-generational, mutualistic relationship in which one organism assumes a significant degree of influence over the reproduction and care of another organism in order to secure a more predictable supply of a resource of interest, and through which the partner organism gains advantage over individuals that remain outside this relationship ...
The house crow (Corvus splendens), also known as the Indian, greynecked, Ceylon or Colombo crow, [2] is a common bird of the crow family that is of Asian origin but now found in many parts of the world, where they arrived assisted by shipping. It is between the jackdaw and the carrion crow in size (40 cm (16 in) in length) but is slimmer than ...
From National Geographic: A video of the New Caledonian Crow making a hook out of wire (August 8, 2002) Tool use in crows is a combination of natural ability and schooling by other crows – LiveScience.com (October 31, 2006) BBC news website item about the New Caledonian Crow, includes video footage of tool use (August 16, 2007)
The centre of the nest is neatly lined with hair, coir or other fine fibres. The usual clutch is three to five pale blue-green eggs speckled with brown. The eggs hatch after about 17–19 days and the young fledge in about a month. The nests are sometimes parasitized by the Asian koel, although not as frequently as the house crow. [22]
As is the case with chickens, various breeds have been developed, selected for egg-laying ability, fast growth, and a well-covered carcase. The most common commercial breed in the United Kingdom and the United States is the Pekin duck, which can lay 200 eggs a year and can reach a weight of 3.5 kg (7 lb 11 oz) in 44 days. [34]
Food is taken both on the ground and in trees. On the seashore it can be found turning over objects to find its food and it will take a wide range of invertebrates such as small shellfish, crabs, and insects. Fruits of many types are also taken and eggs and nestlings are also on the menu when opportunity arises.