Suture separation, on black bear skull

Get some Elmer's Glue (white) into the crack with a toothpick. If misting it with water gets it to close, then try that and then apply the clamps until it is absolutely dry. That will take several days. Elmer's is water soluble so to try not to get too much water on it. Get enough into the split to make a good bond. After you tighten the clamps, if any oozes out, wipe it off with a damp cloth. Hopefully when dry this time the glue will hold. ... Curious as to how it was cleaned initially.

 

Elmer's dries clear and errors are easily corrected by soaking in water. Gorilla glue Expands though it is white (at least the one I have is). It won't soften in water once set and long term, I don't know if it might discolor.

 

This happens on the younger bears. They are still growing and the skull has more room to flex. The older the bear the more fused the skull is. I have glued the crack before but I hate the look of glue in the crack of it does open a bit. I'd soak and use zip ties, snug up the zip ties as it dries. I'm sure the clamp would work too. Dry it slowly and hope for the best but dont be disappointed with some minor separation, that's nature.
Good luck.

 

Also check the humidity in your room, too dry and the separation will be exaggerated. It may be fine in a normal humidity range.

 

Let me know how it works. I get a lot of small bears too.