Well, I ran a simulation last night with animal minimalis to try and figure out a good value for the default mutation rates for 2.4.6.
I see one bot reproduce like crazy. Cancer I thought. It slowly takes over, and all other bots die. Disgusted, I just go to sleep.
Come back in the morning, and I have groups of bots of about 6 or 7 that travel together and feed on veggies. Apparently I had it so that shots returned (in the costs page) were fixed and not dependant on body.
Anyway, I was just really impressed. They were able to travel together because there wasn't any friction to slow them down. If one reproduced, the new bot would have the same velocity...
Anyway, people should try that. It's really rather interesting.