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 venoms are glands that secrete the zootoxins are a modification of the parotid salivary gland found in other vertebrates, and are usually situated on each side of the head.