We live with a few miles of a huge chunk of state land so it's normal to see the occasional coyote or javelina. It's just strange that he is hanging around. How to do you identify or find a coyote den? I've never had to look for one before and if I do manage to find it is there anything I can do other than fill it in to get them to leave? I haven't see any other coyotes just the one so far definitely don't want more showing up lol
I have been told that they really only use dens when raising pups and otherwise are on the move or just bed down in the brush. I'm not sure if this is accurate or not

When I walk the dogs in the field near our house there are lots of big holes in the ground, holes big enough to roll a soccer ball down. I figure a big animal has to make the big holes and for us it's either a badger den or coyote den or holes from badgers and coyotes digging up smaller critters to make a meal. I fill them in. I roll rocks down them. Again, I don't know if this is really doing anything, but I figure if their "safe" home is disturbed and no longer "safe" they will move on. I hope so anyway.
If there really is only one then it's probably one that got the boot from his family and is now on his own until he can collect some girls and start his own family pack. If this is the case he's probably hungry and looking for an easy meal since he doesn't have a pack to hunt with. This is speculation though, just because you only see one doesn't mean there aren't more. Most of the times I hear them I hear many, but most of the times I actually see them I only see one.
Living with wildlife is a delicate balance. Good luck. I hope he doesn't cause problems for you. I'd keep your flock on lock down for some time.