Thermoregulation
Many supposedly cold-blooded animals do things to keep their temperature higher than the surrounding air or water. Fast-moving fish, like tunny, and some sharks, keep their temperature above the level of the surrounding water. Reptiles such as lizards and snakes sit in the sun when they are cold and in the shade when they are hot. Some insects control their temperature, especially colonial insects. Termite mounds have 'air conditioning': their system of openings and galleries allows currents of air to flow through the mound. Honey bees fan their wings to cool their colony. However, many smaller invertebrates do not control their body temperature at all.