Fact 1: Ethologists usually study how animals behave in their natural environment.

Fact 2: Germs are a natural part of the environment.

Given the two facts above, answer the question "Ethologists usually study how animals behave around what?" with the following options: 
- Birds
 - germs
 - islands
 - humans
 - Summer
 - food
 - seasons
 - wetland


 

  germs       