Sirens (Family Sirenidae)

Sirenidae, or sirens, are a family of aquatic salamanders. Family
members have very small fore limbs, and lack hind limbs altogether.
In one species, the skeleton in their forelimbs is made of only cartilage.
Sirens are found only in the south-eastern United States, and northern
Mexico. In contrast to most other salamanders, they have external gills
bunched together on the neck in both larval and adult states.

Sirens are generally eel-like in form, with two tiny, but otherwise fully-
developed, fore limbs. They range from 25 centimetres (9.8 in) to 95
centimetres (37 in) in length.

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