“One of the reasons I think he might be preferring to haul out on pontoons is because it perhaps feels a bit like a floating iceberg.
“It’s not really their natural habitat, it’s a bit too far south, a bit too warm, which is a strange thing to say for Scotland.”
A walrus appeared in North Ronaldsay, Orkney’s northernmost island, in 2013.
Another was spotted at same island before heading a bit further south and resting on the island of Sanday in 2018.
Bain added: “From what we understand, it’s not entirely unusual for a young walrus to explore a little further than their normal range.
“They are not common to come to the UK but equally it’s not completely unheard of.
“I guess they’re just growing up and exploring.”