Looks like I'm late to the party. Glad to hear other folks are having fun with it :-)

I didn't know it came via Scottish, but that makes sense. It's called tandem or alternating tandem reels there? 

It's not clear to me how it ended up being called a dolphin hey instead of a falcon hey; but I'm not going to try to change that vernacular. 

When I ran it for contras, I had a demo on the floor (jumping down myself to do it, or working with a couple I had taught ahead of time). If I keep it rotation, I'll see if I can develop the language to teach it completely verbally; but for now I'll rely on a demo. I'd also be curious how other folks teach it; and I'll query some instructors of Scottish and/or English. 

It was fun to see Kittyhawk Hornpipe in the RPDLW archive. Thank you Yoyo for pointing that out. I didn't manage to find a transcription of Nils's Maggot. What dance did you substitute a dolphin hey into?