Ring neck doves

In Sheridan, Wyoming we heard a curious creature. When we got binoculars on the bird it was plainly a ring neck dove. But, contrary to the bird books, its call sounded like it was taking cooing lessons from crows. OK, sometimes it cooed, but sometimes made a sound halfway between a coo and a caw. Yes, there were several of them, so it wasn't a weird individual.

Has anybody else heard this?