Swallows is the same.  I would have been very justified in only doing one life list entry for all of them, because they aren’t all that different from each other, to an inexpert eye.  Normally I wouldn’t be able to pick out differences like this, but I have had some fortunate encounters over the years which made those differences more plain – situationally.

Cliff swallows are much like barn swallows – white and orange on bottom, iridescent blue on top – but the orange white and blue are in funkier stripes and swatches on cliff swallows.  Their look reminds me of over-designed tennis shoes.  That’s why barn swallows are the ones in tattoos.

I guess the main difference would be nesting in cliffs?  And artificial structures that have similar qualities, like under bridges and eaves.  The only reason I’ve ever seen one well enough to positively ID it – to tell the difference between it and a barn swallow – is that there is a nesting site at the Billy Frank Jr Nisqually National Wildlife refuge, which for all I know has an invisible dei in front of its url and is about to be renamed The White Mayonnaise National Pile of Mosquitoes and Birds We’re Going to Kill Wetland Condos.

That nesting site is a covered walkway near the visitor center, which has nests used by multiple species of swallows, rubbing shoulders with each other.  They’re so close to passers by that you could reach out and grab them*.  Fantastic!  I don’t know what season they’re around, don’t remember what time of year I was there because seasons not very distinct in the PNW.  But if you can find that out and pay a visit, you will get swallows on your own life list.

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*don’t, of course.