Mant Population Boom

I found one reason that causes mant overpopulation and am addressing it, but it seems there must be another one.

Do you happen to know if any aporkalypses happened between building this cage and taking this screenshot?

I always went to the Apocalypse calendar right before it happened and turn it ahead when just reached the Aporkapypse. So I believe there are not  problems regarding Aporkalypse. Well, I could do another experiment on it... 

Actually I think maybe the real problem is their attacking mode like spiders. When one is attacked, new ones will spawn from the nest and join the battle. However, the spiders would go back to their nest while mants don't have that movement code.

Edited February 24, 2019 by Last_epilogue