Also, the ones shaped like Vanilla mobs seem to drop twice as much loot as their real mob counterparts. I'm guessing this is to account for half-breeds to be able to drop one of each of the parents' loot.
You can catch a bunch of darwinian Endermen, keep 'em in a pen, and breed them for a cheap, easy enderpearl farm. According to the b-team's videos, endermen seem to be pretty rare otherwise.
The mod isn't listed in the modpack though. I hope they weren't planning to remove it.
*EDIT*
After some more experimentation, I've discovered my assumption about the reason for multiple drops was wrong. Instead, breeding creatures will yield different drops. For example, the "pikachu" mobs drop redstone dust naturally, and the "Endermen" drop enderpearls, as stated. However, their half-breed offspring drop two Ghast Tears each upon death. An Enderman-Zombie cross breed will drop Blaze Rods.
I will try to spend more time cross breeding and try to make up a table of useful drops and how to get them.
