Fact 1: Earth 's magnetic patterns are used for finding locations by animals that migrate.

Fact 2: Bird migration is common.

Given the two facts above, answer the question "Earth 's magnetic patterns are used for finding locations by which creatures?" with the following options: 
- animals
 - Frogs
 - bats
 - birds
 - dogs
 - humans
 - horses
 - insects


 

    birds     