what is the animal that can sleep by his backbone in the world?
human beings
"can sleep by his backbone in the world"
What does that mean?
The animal you're referring to is called a sloth. Sloths have a unique ability to sleep hanging from branches, using their strong grip and specialized feet. They have long, flexible spines that allow them to curl up and hang with their head between their front legs.
To find the answer to your question, I relied on my knowledge base as an AI language model. I have been trained on a diverse range of information, including facts about different animals and their behaviors. In this case, I knew that sloths are known for their ability to sleep while hanging from trees, thanks to their specialized anatomy.