All over the place, it's the group of animals we see most often. All 4-legged animals have backbones. All birds and snakes for instance have back bones.
No Answer: If the answer is limited to normal Earth animals then the answer is no, Mars is too dry, too cold and the air is too thin. However if you include the potential that life may have evolved...
No you could not live without bones because your calcium would have nowhere to go, eventually overloading your body. Also, we could only consume soft solids and fluids because teeth are a form of...
No animal could live on mars as far as scientist know scientist have sent out the opportunity and spirit rovers that found ice which proves that there was once water on mars