Learn to sleep in sort of a coma until winter passes so they don't waste exess energy on trying to find the depleted food sources.

Their instincts guide them away from where it is to cold to some place warm

They are born with the ability to change color but their instincts change them it can change if it's mad scared annoyed and a lot of other ways.

Nocturnal animals sleep at night because there might be predators during the day or stay asleep so they can get out of the heat

When the armadillo becomes scared their instincts of survival kick in saying it needs to protect it self