Thanks. Discovered that Rancraft Penguins conflicts with the spawn eggs from this mod. I guess it's a choice between having a number of penguins or dino's.
Which version of Rancraft Penguins are you using? If it's 1.4.7h, update to 1.4.7i. If it's 1.4.7i or later, come to the Rancraft Penguins thread and give us the details, because it shouldn't be giving you entity ID conflicts since that version.