Esha Patel, 19, was out for a fishing trip with her dad when they saw three of the animals.
The Cardiff University student from Cheltenham., Glos, said two were brown and one “dazzling white”.
Esha described the experience as “breathtaking”.
She said: “The white one came so close – only three metres away! It was beautiful and so cute.
“I think it liked me because I threw it some bread – I loved it.”