How big they are: Can range from 4 inches (10 centimeters) to over 30 feet (9 meters) There are about 4,000 different snake species in the world today. They occupy a wide range of habitats — some ...

Snakes "smell" with their forked tongues, collecting scent particles to analyze with their Jacobson's organ. Snakes don't have external ears. They sense vibrations through their jawbone and inner ear.