The one overlapping the front of the other is the whitesided dolphin. I should have drawn the rightwhale dolphin overlapping the whitesided dolphin though, to show that it doesn't have any dorsal fin, which I find pretty cool, I personally think they should have been called sea-serpent dolphins, but yeah... XD

And yep, the white-sided dolphin is sort of hugging the rightwhale dolphin. I imagine they're close buddies. I might make OCs out of 'em since they're fun to draw. ;u;

art, characters c) me