Just look in the Mo' Creatures thread. If it doesn't say 1.5_01, it's not updated.
I believe the author of Mo' Creatures has some personal issues right now, and also take into account that most mods use MCP, which has to be updated before any mod makers can even start the updating process.
I rather him not updating the mod and let someone else do it. LAZY B*!*@#($
Dr. Zhark has worked hard on a fun little project to make the game more enjoyable for himself, and he's released it to the forums in the hope that others will enjoy it as well.
It is just WRONG of you to call him a "LAZY B*!*@#($" just because he doesn't wait on you hand and foot! Seriously kid, get over yourself!