To control body tempature as Animal it needs to do 3 things. (1) the Animals must find a source of heat. (2) Animals must be able to get rid of excess heat when temperatures increase. (3) Animals must be able to conserve heat when temperatures drop. using the process of elimation the answer to the question is ( Animals must switch between ectotherm and endotherm methods). if you have your biology book on hand for the course the answer is on page 685 if you want to find the answer yourself. its under the heading "body tempature control."