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

Fact 2: Many ethologists capture their observations on videotape or audio tape.

Given the two facts above, answer the question "Scientists study animal behavior through which of the following?" with the following options: 
- audio and video tape
 - Electrical energy
 - irradiation
 - A computer
 - raising their temperature
 - Something coming from a gland
 - The bending of a ray of light
 - characteristics


 

 audio and video tape        