This is considered the world's smallest snake species, with adults averaging around 4 inches (10 centimeters) in length.

Barbados Threadsnake

Found in the western United States, this snake is about 5-7 inches (12-18 centimeters) long.

Western Blind Snake

These snakes, found in the southeastern United States, are only about 6 inches (15 centimeters) long on average.

Ringed Threadsnake

Black Blind Snake

Another small species found in the southwestern United States, reaching lengths of about 7-9 inches (18-23 centimeters).

Narrow-Headed Snake

This snake, found in North America, has an average length of 9-10 inches (23-25 centimeters).

Puget Sound Garter Snake

A subspecies of the garter snake, it's one of the smallest in the garter snake family, averaging around 10-12 inches (25-30 centimeters) in length.

Smooth Earth Snake

These snakes, found in North America, are small and slender, typically measuring about 7-10 inches (18-25 centimeters) in length.