Heartwarming photos captured off the coast of Wales show a mother seal teaching her young pup how to swim as numbers of the marine mammals continue to soar.

Britain's grey seal populations dropped alarmingly low to only 500 in the 20th century but now over 120,000 can be spotted around the UK shores.

Dedicated animal photographer Andrew Fusek-Peters, 57, snapped the tender scenes this week at Abercastle in Pembrokeshire, Wales.

He used a zoom lens in order to capture the natural moment without distressing the young animal.

Andrew said seal pups can't swim for the first few weeks so these swimming lessons are vital for their survival.

South Wales Argus:

The seal pup gaining his confidence in the water thanks to the careful teaching of his mum. Picture: SWNS

The dad-of-two, of Lydbury North, Shrops., added: "I think it’s miraculous to see. The UK has 40 per cent of the worlds population of grey seal.

"They were a species that were struggling. The big issue with seals is that people were so close to them and get near the pups.

"The pups can’t swim for the first few weeks. A lot of them can drown in the early stage.

South Wales Argus:

A seal pup leaning on the back of its mum as she teaches him to swim

"It's important to know that I'm a long, long way away in order to capture this.

"You can see the see intimacy in the photo's, her teaching her young to swim."