well i use ALOT of zt1 downloads and mine all work like the other animals , so it may just e the ones that you are using, i only use the real animas, as i dont like the made up ones, so may its the mde up ones, or prehistoric, or i may be a glitch in sertain peoples disks, like the golapicos tortoiuse for zt2 makes my game go of but not may others disks are like that, i know the problem is zt1, i was ust using that as an example of it on other games :happy