Snakes are legless.
I detest snakes ,they are footless reptiles
Snakes need warmth to be active.
Sure!They are ectothermic, amniote vertebrate with overlapping scales 
Not all snakes are venomous.
Well,it could be true ,but In Africa the most dangerous species include mambas, Egyptian cobras, puff adders, and carpet vipers;.
brightly colored snakes are what you have to look out for. They are most dangerous.
Snake venom
Snake venom is a highly modified saliva containing zootoxins that facilitate the immobilization and digestion of prey, and defense against threats. It is injected by unique fangs after a bite, and some species are also able to spit their venom.
The glands that secrete the zootoxins are a modification of the parotid salivary glands found in other vertebrates, and are usually situated on each side of the head, below and behind the eye, and encapsulated in a muscular sheath. The glands have large alveoli in which the synthesized
List of dangerous snakes
The varieties of snakes that most often cause serious snakebites depend on the region of the world. In Africa, the most dangerous species include black mambas, puff adders, and carpet vipers. In the Middle East the species of greatest concern are carpet vipers and elapids; in Central and South America, "Bothrops" (including the terciopelo or fer-de-lance) and "Crotalus" (rattlesnakes) are of greatest concern. In South Asia, it has historically been believed that Indian cobras