I have seen 2 large mammals in the last couple of weeks, 1 was definetely a Mink swimming and at another location in Kent a distant mammal swimming. The Mink was swimming with its head and body visible creating a long dark shape whereas the other mammal was swimming with its head clear and then only a small part of its back visible, this created a head, water, back, water impression. Do these 2 species of mammal swim diferently and show the features i have described.
Marc Heath
Marc Heath