The photoreceptors in the retina that are more numerous in nocturnal birds are the __________.
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Q51: The seasonal loss of bird feathers is
Q52: The exchange region in the bird lung
Q53: The integration of muscle-position sense,equilibrium sense,and visual
Q54: Because birds lack teeth to grind up
Q55: Because the kidneys of sea birds don't
Q57: The major nitrogenous waste excreted by the
Q58: In flapping flight,the feathers at the wing
Q59: A unique feature of the bird respiratory
Q60: The famous fossil bird from the Jurassic
Q61: If it is an advantage to be
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