That tiny little spec next to my ID is an ant, a type of ectotherm. Ectotherms, most commonly known as cold-blooded animals, control their internal temperatures by exchanging heat with their surrounding environment. Another word to describe an ectotherm is poikilotherm. Ectotherms, like lizards, may bask in the sun to heat up and then move to the shade to cool down. Insects, lizards and snakes are all examples of ectotherms.