A crane's body is covered almost all over with feathers to keep it warm. But the crane loses heat through its legs because there are no feathers on them. To save as much heat as it can, the crane stands on only one leg and tucks the other one up against its body. Most birds rest their breast on the ground or a tree branch and tuck their wing when they sleep. Cranes and some other water birds often sleep standing in water. They stand on only one leg so that they can reduce loss of body heat as much as possible. Cranes can even stand on one leg all night and it doesn't bother falling down.
Look for outside features - A stand is more than a stand and many people don't know this. You can get some that have the USB hook up on the outside, making it easy for you to use your wires, while others act like a stand. The more features you get, the more you're going to likely pay.
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