New grass snake discovered in the UK

A new type of snake has been discovered in the UK, bringing the total number of species to four.

Scientists say the barred grass snake, Natrix helvetica, is actually a different species to the common or eastern grass snake, Natrix natrix.

Before, it was thought the grass snake was one species with several subspecies that looked slightly different.

The others native to the UK are the smooth snake and the adder, which is venomous.