Can An Ectotherm Be A Heterothermy?

Can An Ectotherm Be A Heterothermy? Some animals usually considered to be ectothermic/poikilothermic can produce heat mechanically in certain body regions. What are some examples of Heterothermy? Bats and hummingbirds go into what is known as torpor and bears hibernate. Both are examples of heterothermy; where the internal temperature of the animal drops during specific