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If eggs are lost to a predator (including humans) or fail in some other way, common buzzards do not usually lay replacement clutches but they have been recorded, even with 3 attempts of clutches by a single female. [3] [17] [115] The female does most but not all of the incubating, doing so for a total of 33–35 days.
In South America, Argentinian and Chilean birds begin egg-laying as early as September, while those further north on the continent typically wait until October. Some in South America breed even later than that—black vultures in Trinidad typically do not start until November, for example, and those in Ecuador may wait until February. [32]
In the US it is illegal to take, kill, or possess turkey vultures, their eggs, and any body parts including but not limited to their feathers; violation of the law is punishable by a fine of up to $100,000 for individuals or $200,000 for organizations, and/or a prison term of 1 year. [87]
The black-breasted buzzard lays its eggs from August to October, with breeding believed to be stimulated by increased day length, as well as by increased food availability often linked to rainfall events. [6] [12] A usual clutch comprises two eggs laid at an interval of approximately 8–13 days and incubated for a period of 32–38 days. [5]
They tend to occur in higher densities where populations of larger Gyps vultures are low or nonexistent. [15] It occurs up to 4,000 m, but is most numerous below 1,800 m. [6] Hooded vultures lay a clutch of one egg, and the incubation period lasts 46-54 days, followed by a fledging period of 80-130 days.
The rough-legged buzzard is a member of the genus Buteo, a group of moderately large raptors exhibiting broad wings, short tails and wide robust bodies. [3] [18] This genus is known as buzzards in Europe but referred to as hawks in North America. [3] Four subspecies of Buteo lagopus are accepted: [2] B. l. lagopus is the nominate subspecies. It ...
These vultures usually lay a single egg a couple of months after the rainy season has ended and the dry season is underway. [7] It is generally a solitary species and nests in isolated, possibly territorial pairs. [8] From a study across 73 pairs, the average productivity of 55 breeding attempts was 0.69 chicks per pair.
New World vultures and condors do not build nests, but lay eggs on bare surfaces. On average one to three eggs are laid, depending on the species. [35] Chicks are naked on hatching and later grow down. Like most birds, the parents feed the young by regurgitation. [42] The young are altricial, fledging in 2 to 3 months. [41]