Try E6000 glue.It's my go to glue for just about anything. After you glue it, try some Apoxie-Sculpt over the damaged area. That will help strengthen the damaged area. Hope that helps. PS......You might want to store the skeletons in a different fashion. All the stress on the neck area from hanging them most likely caused the crack. http://www.walmart.com/ip/24692833?...42959272&wl4=&wl5=pla&wl6=78881812592&veh=sem
http://www.amazon.com/Apoxie-Sculpt...&qid=1431912103&sr=8-1&keywords=apoxie+sculpt
http://www.amazon.com/Apoxie-Sculpt...&qid=1431912103&sr=8-1&keywords=apoxie+sculpt