Classroom lesson · Wildlife · 🇧🇧 Barbados

Barbados Threadsnake

The world's smallest snake — thin as a strand of spaghetti!

A tiny Barbados threadsnake coiled on a coin to show its minuscule size

Photo · Wikimedia Commons

What is it?

The Barbados Threadsnake holds the record for being the world's smallest snake. A fully grown adult is only about 10 centimetres long and thinner than a strand of spaghetti. It was officially described by scientists in 2008 and is found only on Barbados, living beneath rocks and in the leaf litter on the forest floor.

Tell me more

Despite looking a little like a worm, the threadsnake is definitely a snake — it has tiny scales, a forked tongue, and the long slender body shape that all snakes share. Its official scientific name is Tetracheilostoma carlae. Scientists named it after Blair Hedges's wife, Carla, who also studies animals.

Threadsnakes feed on the eggs and larvae of ants and termites, which are just the right size for such a tiny predator. They find their meals by following the scent trails of insects underground and beneath fallen leaves. Their small size lets them wriggle into very tight spaces that larger snakes could never reach.

Because threadsnakes are so tiny and well camouflaged, they are rarely seen by people. Scientists believe they must be quite specialised — living in a very particular habitat — which is one reason they are found only in Barbados. Discoveries like this remind us that even a small island can hide creatures completely new to science.

In the classroom

Walk your class through this in 15 minutes.

Talk together

Discussion prompts

  1. 01Why might a very tiny snake be harder for scientists to discover than a large one?
  2. 02The threadsnake was only officially described in 2008. What does this tell us about how much we still have left to discover in nature?
  3. 03If you discovered a new animal, what would you name it and why?
Try this

Classroom activity

Cut a piece of string exactly 10 centimetres long to show the length of a fully grown Barbados Threadsnake. Then look up the world's largest snake and cut another piece of string to show how long that is. Line them up side by side and write two sentences comparing the two.