Dogs sleep more than us, but they wake more frequently than we do. How much and when they sleep depends on the level of activity in their environment. A dog living as a pet in the home is likely to sleep more than a dog that works for a living, like a search and rescue dog or a dog working on a farm.
In the colder winter months, some rattlesnake species enter a period of brumation, which is dormancy similar to hibernation. They often gather together for brumation in large numbers (sometimes over 1,000 snakes), huddling together inside underground rattlesnake dens or hibernacula.
Snakes have many vertebrae in their backbonesâin some species, their vertebrae number in the hundreds. The vertebrae of a snake's backbone are loosely jointed together to enable them great flexibility. This enables them to move with great agility and to wind their bodies into compact coils.