hard · SAT Reading & Writing
Researchers investigating the social structure of the endangered kagu, a flightless bird native to New Caledonia, observed that the species exhibits high levels of parental cooperation. [While both parents share incubation duties, males typically spend a significantly higher proportion of time guarding the nest site against potential predators.] This division of labor persists throughout the breeding season, even when food resources are plentiful enough to allow for different foraging strategies.
Which choice best describes the function of the underlined portion as a whole?
- It suggests that parental cooperation in kagus is only necessary when food resources are scarce.
- It specifies a particular aspect of the cooperative behavior mentioned earlier.
- It identifies the primary predator that threatens kagu nests during the breeding season.
- It explains why incubation duties are more exhausting for female kagus than for males.
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