The echidna cannot sweat or pant

The short-beaked echidna is an Australian mammal that suffers from a serious thermal handicap because it lacks sweat glands and cannot pant. To compensate for this inability to withstand heat, the animal reverses its lifestyle during the hot season by sleeping during the day to hunt at night. It can also hibernate in very cold regions and easily slips everywhere by digging the ground with its powerful front paws.