Many species of bird are migratory as well as Eels, Salmon, Sewin, Shad (fish) and the Painted Lady butterfly, I believe. There are sea mammals native to the UK, Wildwood, two populations of bottlenose dolphins (Cardigan Bay and Moray firth) as well as harbour porpoise and grey and common seals. Other species of whale and dolphin are sometimes obsreved off our coasts but they are better described as transient rather than migratory as their movements don't seem to follow a set pattern.