Snakes irl:
They are reptiles without legs

. They look a lot like those of the summonings in the naruto world, but of course a lot smaller. They slither around and can do it quickly to compensate for their lack of legs, and every once in a while, they shed their skin for a new one. They must keep their body warm, and they do this by staying in the sun a lot. Some are small, while others can go up to feet long. They are thick and they use their entire body to strangle their prey and they can eat them up despite their thin body. thats all i know <_>
Snakes in NarutoVerse
Snakes are the personal summoning of Orochimaru, Kabuto, Sasuke, and Anko. Like the Toad summon, Snake summons have their own variations of the Sage mode. Snakes live in Ryuchi calve, a place like mount myoboku and Shikkotsu forest and the known white snake sage mode users learned it there. The snake summon comes in different size, shape, body mass, and even species. Some are small enough to hide in your sleeves while others are large enough to be larger then buildings. Some are thin, even thin and small enough to tie someone's hands while others are larger and much thicker, capable of choking and constricting Turtle Island. They cannot talk, however, some some summoners are shown to communicate with them. By using heat and smell, they are able to track down their masters prey or target and lead their master to it. Most snakes are obedient and follow the tasks their master sets, however, some are like Manda who demands human sacrifice for his cooperation. The snakes include aoda, three giant snakes, Manda, Manda II and white snake sage. To summon the snakes, the summoner can either get a summoning tattoo and/or the usual and normal summoning jutsus.