from Sunday Herald, 05 February 2012
Scotland has a new snake. The first firm evidence that the grass snake is now living in the wild north of the border has been uncovered by a naturalist, upsetting decades of conventional wisdom.
It has long been assumed that the grass snake, a non-poisonous native of England, had not colonised Scotland. A few kept as pets had escaped, but there was no proof that any lived here, or had spread north naturally.
But now Chris Cathrine, a member of the Clyde Amphibian and Reptile Group and director of the Caledonian Conservation company, has discovered grass snakes in Dumfries and Galloway. There have been three verified sightings of the animals since 2009 and three more possible sightings in the area, according to a study he has completed.
“This is very exciting because it’s the first incontrovertible proof that grass snakes are present in the wild in Scotland,” he said. Along with the adder, the common lizard and the slow worm, it brings the number of native Caledonian reptiles to four.
Grass snakes could have spread north from England, encouraged by the warmer temperatures triggered by climate change in recent years. Or they could have lived here undetected for a while.
Cathrine’s investigation started in 2010 after he saw a grass snake in a pond in Upper Nithsdale. “I was balanced on a raft of vegetation searching for great crested newt eggs when I flushed out the grass snake,” he recalled.