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Female birds are able to produce more of a certain gender of birds that are more likely to survive under extreme conditions. In birds, the females' egg determines the gender of the offspring, not the male's sperm. In zebra finches, a study showed the effect of food on gender ratio production. For females, egg production is a metabolically ...
The species complex was first described by the ornithologist John Latham in 1790 as Psittacus banksii, [4] commemorating English botanist Sir Joseph Banks.The red-tailed black cockatoo also has the distinction of being the first bird from Eastern Australia illustrated by a European, as a female, presumably collected at Endeavour River in north Queensland, was sketched by Banks' draughtsman ...
A baby kangaroo, known as a joey, inside their mother's pouch. Altricial young are born deaf, blind, almost completely hairless and have very limited motor functioning. [1] The maternal behavior in these species is primarily focussed on providing warmth for the young since they are unable to thermoregulate. [4]
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Potoos lay their eggs in December to begin their roughly 51-day nesting period, one of the longest nesting periods for birds their size. [23] Young potoos hatch after about 33 days, using their egg tooth to break free and emerge as downy individuals with pale brown and white stripes. [23] [21] The hatchling is fed by regurgitation. Parents ...
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Brood reduction occurs when the number of nestlings in a birds brood is reduced, usually because there is a limited amount of resources available. It can occur directly via infanticide, or indirectly via competition over resources between siblings. [1]
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