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Kacelnik proposed that birds sing more at dawn and dusk because low light levels make feeding relatively unprofitable. Colder temperatures also make prey less active and thus harder to find. So why do birds wake up before they can feed, and why don't they wake up much earlier to lengthen the dawn chorus? It may be that other birds are unresponsive until only shortly before foraging becomes possible. Birds could listen to mates or neighbors singing overnight, but much social behavior contingent on that signal might plausibly occur only when there is some light. Such social interactions like chasing intruders or mating could be performed effectively at light levels at which foraging is still inefficient.

The passage suggests that the "other birds are unresponsive" primarily as a result of the

Adanger of revealing themselves to potential predators
Bunprofitability of foraging behavior at colder temperatures
Clack of sufficient light for certain social behaviors
Dfact that birds, like much of their prey, are less active at colder temperatures
Eneed to conserve energy for foraging

C显示答案

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