Aren't you going just a little OT, azn?
btw, the Northsea has dolphins....like this one, the smallest species
Phocoena phocoena:
and this one...
Tursiops truncatus:
and the white-tipped
Lagenorhynchus albirostris
So that's 3 species, feeling perfectly at home in the relatively cold Northsea.
In my game - sailing from Bergen - I always encounter some when leaving the Norwegian coast.