Question

how it is possible that tortoise lives under ground

Answer 1

Shelter:
Every creature needs a place to live, even one who carries a shelter on his back. Cold-blooded reptiles cannot change their body temperature according to their surroundings. As a cold-blooded reptile, a tortoise uses his burrows to keep warm in the winter and cool in the summer. They build different burrows at different times and different locations so that he will always have at least one that can keep his body the right temperature.
For example, north-facing burrows stay cooler, while south-facing burrows tend to stay warmer.

Safety:
There are many animals such as birds of prey, coyotes, foxes, cats, wild pigs, dogs, roadrunners, etc. that love to eat eggs of tortoises. This is the main reason for their low population. Most of the eggs are eaten these animals before they hatch. A burrow provides a safe place for him to hide from other animals looking for a tasty snack. Keeping several active burrows ensures that one will be nearby when he needs it.

Hibernation:
Tortoises are reptiles. So they hibernate in winter, which means they need a safe, warm and dry place to literally live in until spring. A burrow meets all these requirements. He doesn't have to worry about predators catching him sleeping, the underground space stays warm enough to keep him from freezing to death, and runoff from rain and snow doesn't flow into a properly built burrow.

Nesting:
A female tortoise doesn't always nest inside a burrow, but she will often lay her eggs near the entrance or within the nearby vicinity. Some tortoises, however, build a nest deep within a borrow or in the tunnel leading to it. Since a female tortoise will often have more than one nest or clutch of eggs, she may use several different burrows for nesting.


For these factors, a tortoise lives underground. Like most reptiles, tortoises have small paws with which they crawl. They uses these small paws to dig and create burrow.