Explore BrainMass

causes of bird migration

This job names proximate and ultimate causes of bird migration.

Solution Preview

Arctic Turn - bird that lives in the Arctic Circle during the summer and Antarctica in winter

Evolutionary Causes Or Ultimate Causes -
Cost -Long journey with high mortality. Territory given up
Benefit -(why not just stay in one place) Going to an area where days are longer so there is more time to forage and thus more offspring can be supported. Less predation occurs due to fluctuating prey amounts. Parasites are less likely to survive in a different environment

Proximate Causes -
Idea, the sun is used as a compass
- Train a bird to go east to feed at 6:00 ...

Solution Summary

This job describes various causes of bird migration.