by the way, for the time being you can spawn them using the /summon command
@kumasas thank you that makes more sense. My bad!
correct me if I'm wrong, but it seems your using "1.8.0_25" from "Tue Sep 02 09:24:35 BST 2014" not "1.8.8"
Were you on a Server or single player?
Asaf Pollock
by the way, for the time being you can spawn them using the /summon command