Dog walkers and parents have been warned to beware of adders after a higher-than-normal number of Britain's only venomous snake have been spotted in north Norfolk.

Eastern Daily Press: An adder at Pretty Corner Woods at Sheringham. Picture: JO JOHNSAn adder at Pretty Corner Woods at Sheringham. Picture: JO JOHNS (Image: Archant)

Jo Johns, of Sheringham, regularly walks her dog, Neelix in the area and said she had seen many more adders this year than any time previously.

She said they had almost become a common site in Pretty Corner Woods, just outside the town.

She said: 'I have lived in Sheringham for nearly six years and up to last week had only seen three in Pretty Corner Woods.'

Ms Johns said she had seen four of the snakes over the past week, most of which slithered away when they sensed a human approaching.

Eastern Daily Press: A young adder - about 6in - seen on Syderstone Common last week. Picture: NEIL DYSONA young adder - about 6in - seen on Syderstone Common last week. Picture: NEIL DYSON (Image: Archant)

She said: 'One just sat there, the other three moved off into the undergrowth.

'But I am super wary and looking for them, to protect Neelix. But if you suddenly came across one or trod on one it could bite you, or your dog, etc.

'I don't know anything about adders, except keep clear of them and watch your dog.

'Dog owners, people with children and others should be careful.'

Eastern Daily Press: An young adder spotted at Beeston Regis Common on June 15, having just eaten a meal. Picture: GREGORY KNOWLESAn young adder spotted at Beeston Regis Common on June 15, having just eaten a meal. Picture: GREGORY KNOWLES (Image: Archant)

In May, we reported on a dog left fighting for its life after being bitten twice by a snake.

Although an adder's venom is not considered life-threatening to a healthy adult, the bite is very painful and requires urgent medical attention.

*Have you spotted any adders in nature so far this year? Email you photos and experiences to stuart.anderson@archant.co.uk