Talk:Bugs/@comment-99.140.219.5-20120723182251/@comment-5103836-20120723183132

The dinos not only need to be level 4, they also need to be the same tier. You can only fuse dinos of the same tier, so two tier 1 dinos that would be fused into one tier 2 dino, for example. I'm guessing you have two dinos of different tiers.