Snakeman is one of the sentient races that fight against X-COM during the First Alien War.
Snakemen are military race, their objectives appear to be purely predatory. Evolved in an extremely hostile environment, Snakemen have extremely tough skin and can resist extreme temperature variations. Their mobility depends on a snake-like giant "foot" which protects all the vital organs. The muscular system uses hydraulic principle to create motion, only true muscle is the "heart".
Although they work under command of the master races, Snakemen lacking of surgical modification suggest that they are mercenaries operating on their own. Despite being somewhat slow, Snakemen are far stronger than Sectoids and Floaters, they are also good at using weapons.
While other sentient alien races rely on cloning chamber for reproduction, Snakemen breed naturally. Their asexual reproductive system is very efficient, each snakeman carrying up to fifty eggs inside its body at any one time.
Snakemen are frequent terror agents, and are accompanied at terror sites by the fearsome Chryssalid.