Sirens are quite distinct from other salamanders, and genetic analysis confirms that sirens are not closely related to other salamander groups.
Sirens are generally eel-like in form, with two tiny forelimbs. Their size ranges from 9.8–37 in. The adult siren has fully-developed gills. They are able to cross land on rainy nights.
Sirens feed mainly on worms, small snails, shrimps, and algae.
They are also able to burrow into mud of drying ponds and encase themselves with a cocoon of mucus to survive periods of drought.