['I saw a wolf or coyote in my yard a while back and I think it killed a little beaver that lived in the creek  for years behind my house.']
That must have been amazing to see!  Did you try to scare it away or just watch it?  Be careful since it sounds like it may be dangerous.
I think I have a coyote or wolf running around my area. I think it killed a little beaver that lived near the creek  near my house.