Coyotes are probably one of the most resilient of all wild species.
When you hear them howling they are communicating and testing turf.
Often the howls are a chain reaction that goes on for miles and miles.
When they don't hear howls in areas that offer good habitat, they move in.
I've been told by biologists that even if you tried to eliminate them all it is highly doubtful that you would succeed.
The range that these were taken from will see a spike in rodents and deer & antelope fawns and will provide a bounty of nutrients for the coyotes that move in from surrounding areas.
Those well fed females will in turn have bigger litters of pups in the spring and the cycle will complete itself all over again.
The photo with all of the dead ones in it is indeed from a very large area.

Excuse me, I've got more skinning to do.