Update: I have the beaver dam level 7 from a previous event, but no beaver. Now I got the beaver from the current event and he needs beaver dam level 10. I tried removing an animal from one of the wildlife dens to add the beaver, but still getting message that I need beaver dam level 10. Do I have to delete/sell the beaver dam 7 to be able to add the beaver to one of the wildlife dens? Is anyone else having this same problem?