Do crocodiles hibernate estivate or migrate?

Crocodiles do estivate. It is a very interesting biological state in which the crocodile enters everything is slowed from respiration to circulatory functions. at average a crocodile heart beats approximately 40 times per minute when a crocodile is estivating, its heart rate slows down to about 5 beats per minute and can remain in this "standby" state for a year or more, depending on the conditions.