Cold-blooded animals living there do not generate much heat and their body temperatures are so low that they live in a state of slow motion.

Others favour the idea that they kept these cold-blooded animals warmer, allowing them to remain more active (and potentially munching on more unfortunate park visitors) for longer each day.

Chromatophores are largely responsible for generating skin and eye colour in cold-blooded animals and are generated in the neural crest during embryonic development.

Some species of cold-blooded animals change color swiftly, to camouflage themselves.

At the end of the last ice age, cold-blooded animals, smaller mammals like wood mice, migratory birds, and swifter animals like whitetail deer had replaced the megafauna and migrated north.