Seals are naturally wary of humans while they're lying on a beach - once they're in the sea their nervousness seems to disappear and they were happy to splash around in front of us.

Except for one we saw.

As the small group of journalists and National Trust staff stood on the shingle some distance from the main group at Orford Ness, a seal came out of the sea right in front of us followed by another, a pup.

East Anglian Daily Times: Pluto's tag showed the seal had been treated at East Winch.Pluto's tag showed the seal had been treated at East Winch. (Image: Paul Geater)

The first seal had a yellow tag on one of its flippers which indicated that it had been treated at the RSPCA's East Winch animal hospital.

We took a photograph of the tag which had a number on it - and that allowed the NT staff to find out the seal was treated at East Winch last year after being found close to death at Horsey in Norfolk.

It had been named Pluto and while at East Winch its weight had gone up from 19 to 39 kilos. It was released on Sutton Beach in south Lincolnshire last June - and has now turned up at Orford Ness.

NT officials believe the fact Pluto had been treated at East Winch might make it less wary of humans than other seals - and that may have been why it came on to the beach while most other seals watched us from the sea.

Keeping tabs on seals after they have been released back into the wild is vital for research and a spokeswoman for the National Trust said it was good news to see Pluto in such good shape.

She said: "Pluto looked fine and had clearly been able to swim over a wide area which is just what they should do."