Talk:Spider Den/@comment-50.161.212.131-20140916220608/@comment-9540515-20141223021012

Its because a spider den can't evolve when there is no spiders present. I'm just assuming that the beefalo killed all the spiders. To top it off I have a tier 2 spider den that took 78 days to evolve from a lvl 1 because there was no spiders inside.