attract a better mate compete for resources migrate during the winter blend in with the environment
I gave my students this multiple choice question: European starlings are birds that take over the nests of other birds. When they move into an area, starlings reproduce quickly. Taking over the nests of other birds most likely increases the number of starlings by helping them to do what?

Only one answer is correct among these 4 choices:
- attract a better mate
- compete for resources
- migrate during the winter
- blend in with the environment

Could you tell me which one is correct?

compete for resources