Fact 1: Eyes are used for seeing by animals by sensing light.

Fact 2: Pigs are very intelligent animals.

Given the two facts above, answer the question "what uses eyes for seeing by sensing light?" with the following options: 
- oak tree
 - bears
 - pigs
 - humans
 - clouds
 - Whales
 - the sun
 - tigers


 

   pigs      