Migratory birds in the Northern Hemisphere most likely head to tropical overwintering grounds because ____.
A) they are looking for appropriate sites for egg-laying
B) of seasonal changes in the abundance of predators
C) they are looking for appropriate breeding sites
D) of seasonal changes in food supplies
E) they are ectotherms and cannot withstand cold temperatures

Question

Quizplus · Accepted Answer

Migratory birds in the Northern Hemisphere typically head to tropical overwintering grounds primarily due to seasonal changes in food supplies. As winter approaches, food becomes scarce in their breeding areas, prompting them to migrate to regions where food is available year-round.

Migratory Birds in the Northern Hemisphere Most Likely Head to Tropical