5. Young white-crowned sparrows are remarkably good at remembering the sounds produced by adult white-crowned males singing around them. If the learning abilities of these birds evolved by Darwinian natural selection, specific conditions must have applied to the species in the past. Using an explanation relating to evolutionary history what are those potential specific conditions?(5) 6. Describe the Armpit Effect Hypothesis and give an actual or potential experimental example. (5) 7. Why would some bird chicks, such as those from estrildid finch species, have elaborate markings inside their throats? Explain the proximate and ultimate cause of the markings.(5)
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