Seasonal migration enables birds to avoid the physiological stresses of unfavorable climates&#151;to exploit the brief but bountiful insect-rich food supplies of the Arctic summer for breeding and raising young, and then fly south for the winter to the more hospitable weather conditions of the southern United States, Central America, and South America.
(Seasonal migration; enables; birds; to avoid the physiological stresses of unfavorable climates&#151) (birds; to avoid; the physiological stresses of unfavorable climates&#151) (birds; to exploit; the brief but bountiful insect-rich food supplies of the Arctic summer for breeding)
Seasonal migration birds birds
enables to avoid to exploit
birds to avoid the physiological stresses of unfavorable climates&#151
the physiological stresses of unfavorable climates&#151
the brief but bountiful insect-rich food supplies of the Arctic summer for breeding