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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 ...
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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Precocial birds find their own food, sometimes with help or instruction from their parents. Examples of precocial birds include the domestic chicken, many species of ducks and geese, waders, rails, and the hoatzin. Precocial birds can provide protein-rich eggs and thus their young hatch in the fledgling stage – able to protect themselves from ...
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An adult Eurasian blue tit collecting the fecal sac of a chick (just hatched, still naked and blind) to ensure the cleanliness of their nest. A fecal sac (also spelled faecal sac ) is a mucous membrane, generally white or clear with a dark end, [ 1 ] that surrounds the feces of some species of nestling birds . [ 2 ]
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