I'd bet we have racoons...seen tracks by our pond. I'm positive we have skunks. I put a roll of chicken wire in front of the landing board of each hive. The theory is that the skunk will have to stand up to get at the hive, exposing its underneath to stings.
**** can make of mess and will tear open small hives to get to what is inside. I have never had any problem with them from standard sized hives but in a queen rearing yard with lots of small mating nucs they can make a mess.
Had a problem w/ a racoon myself this year. Borrowed a Hav-a-Hart Trap froma friend who told me to take it across two rivers before letting it loose. Otherwise it will find its' way back. So I did. No recurring problems.