I have eaten beaver (cue the jokes). It was pretty good. I haven't tried it yet but I have heard that porcupine is good. The worst thing that I have tried was lake trout. I had heard that they were not great to eat but I gave it a try. I was surprised to find it inedible.
Funny, I have eaten quite a bit of lake trout and find it delicious!! We are picky about trimming away the dark meat. We used to go to Lake Ontario each year for salmon and lake trout, and we would get quite a bit of fish that way!