If a Migratory Species Has Endured Great Hardship to Arrive

If a migratory species has endured great hardship to arrive at warmer winter habitats, why do they ever leave to return to summer homes? Because farther from the equator

A) brood sizes are typically smaller, reducing overall energy costs.
B) shorter periods of daylight make the work of brood rearing less stressful.
C) the sought after areas provide protection from predators less critical at other times of the year.
D) all of the above

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