CONSOLE BEING SPAMMED WITH STDOUT:BAT AND OTHER MOBS!?

[projectmob26]

Ok, so I finally figured out why I'm crashing sometimes.. It seems as the mobs are overspawning! there's too much spawning for some reason and I don't know why? Here's the pic:Http://Gyazo.Com/94bd8f6368e1debb7d64cb4562a1ac3c - As you can see, there are a ton of Bats, Skeletons and Zombies. I need something to kill them off, I know switching to peaceful and back will only help the hostile mobs, but by the looks of the mini-map, the real problem lies with the bats. I am always getting errors in my cmd that says Bat, more than anything.

Here's a picture of the mods used in my custom modpack: Http://Gyazo.Com/E6a939912fdb102da2b6f49430a0ecba

Is there a command to get rid of all mobs or what? Please help!

 

EDIT: On the console, my name and my friends name starting popping up after the STDOUT message, so it's not just mobs... what is going on!? I'm just getting constantly spammed with STDOUT: BAT and SKELETON etc...