Yipping coyotes.
Probably not as many as you think. Maybe a pair and a couple of half grown pups thrown in... (Preview sound C39 on link)
https://www.gofoxpro.com/products/sounds/sound-packScroll down to C32, and run the preview on the right.
It could be a yipping pair as well.
In lots of cases, it sounds like more coyotes than it actually is.
When they make that sound like yipping, others at a distance can join in. Kind of a way of saying "This is my yard. Where are you?"
