Animals can be classified according to their mode of thermoregulation. Sort the animals below, indicating their likely thermoregulatory strategy. Note that poikilotherms are sometimes referred to as heterotherms.
homeothermic endotherm - walrus, eagle, coyote
homeothermic ectotherm - arctic shrimp
poikilothermic ectotherm - butterfly, freshwater catfish, salamander