Taldwirn

While i search some informations for the chocobos mod in Big Dig, I heard about the bug known when you breed chocobos and let them on an unloaded chunk. I try to avoid this and never leave alone chocobos when they breed. But one Chicobo escape and go on an unloaded chunk. Now, the game is completly ruined cause they have so many chocobos than minecraft lag and crash when i try to play. And that even after i try to kill the most that i can. If something exist to stop having this bug, I would like to know it. If not, then, i would like to know which mod exactly add Chocobos, to delete it.