Snakes are a group of reptiles, related to lizards. They belong to the order of the squamata. That are reptiles with scales. All sorts are marked with a relatively very long and thin body and the lack of limbs. Snakes are clear to distinguish with all other animals and most of the other reptiles like crocodiles, turtles and tuataras. With some sorts of lizards is the difference not so clear.
Not only the sea snakes, but almost all snakes can swim and climb perfectly. Most of the snakes live in vegetated areas, like forests, but also in more open areas, like mountains areas and steppes. In tropical forests live more arboreal snakes, that rest at day and hunt at night. In bald areas, like deserts, live snakes in the ground. They burrow themselves often.
To orientate in their surrounding, snakes use the tactile sense, by means of impaired sensory dots on their scales. Smooth snakes mostly have these dots on their head, digging snakes have them also on their tail.
Snakes can’t see very well. They have mainly, in contrast to mammals, no iris muscle and no retractor muscle of their eyeballs. Snakes can generally see a few meters and they can’t distinguish static objects, only moving objects. Visual observation mostly gets used to identify other snakes and threats and not to search for prey. There are some exceptions that hunt at night. Sorts that dig mostly are sometimes almost blind, but sorts that live in trees have generally a better sight. Only some snakes can direct both eyes at the same object.
The skin of snakes is covered by scales and sometimes the skin looks a little bit slimy. But the skin of snakes is dry and water-repellent. Snakes can`t sweat through their skin. The scales are not connected to each other but lay on a elastic skin so the skin can expand by moving, breathing and eating.
A fun fact about snakes is that they change from food preferences during their entire life.
Some snake are specialised in what they are hunting, this means that they are hunting things that they can easily kill.
Snakes have many enemies like other snakes, birds, crocodiles, mammals and even some kinds of fish. Some snakes die because they ate toxic frogs. The king snake is specially hunting other snakes. The birds that are eating snakes are most of the time raptors. The most dangerous enemies of snakes are humans, many snakes are getting killed by us.