Note: All percentages stand for drop chances of one item. Mobs not listed don't drop anything, other than normal drops.
All Mutants drop Rotten Flesh, just so you know.

Suicide Mutant: Gunpowder 0-3 20%  TNT 0-1 40%

Looter Mutant: Bone 0-4 20%   Items Picked Up 0-5 100%

Ender Mutant: Ender Pearl 0-1 35%

Blob Mutant: Slime Ball 0-4 50%  Slime Block 0-1 20%

Leaper Mutant: String 0-2 50%

Jumper Mutant: Splash Poison Potion 0-1 20%  Poison Potion 0-1 35%

Mage Mutant: Wizard Potion 0-1 40%  Villager Head 0-1 35%

Nether Mutant: Nether Star 1 100%

Coco Mutant: Rabbit Hide 1 50% Rabbit Meat 1 50%

Cluck Mutant: Feather 1 40% Chicken 1 100% Egg 1 100%

Beef Mutant: Milk 1 40% Leather 1 50% Beef 1 50%

Wooly Mutant: Wool 1-2 50% Mutton 1 50%

Bloop Mutant: Ink 1 50%

Fungi Mutant: Red Mushroom 1 50% Brown Mushroom 1 50%

Rider Mutant: Saddle 1 100%

Kitty Mutant: Fish 1 50%

Minion 1: Arrow 1 30% Gold Nugget 1 30% Human Skull 1 15%

Hugger: Stone Sword 1 15% Coal 2 30% Wither Skull 1 .05%

Glob: Magma Cream 1 5% Orange Glass 1 40%

Treasure: Enchanted Blaze Rod 1 20% Other Treasure 1-4 10%

Minion 2: Redstone 1 30% Book 1 30% Human Skull 1 15%

Ghost: Gunpowder 2 100% Ghast Tear 1 45% Fire Charge 45%

Mage Mutant (Witch): A Mage walks nearby. So close, that he might be right behind you. Scared? You should be.
This Mage will slow you down and force poison down your throat. "Try to catch him on fire!", you say. Impossible.
He's immune to fire. Luckily, his powers are only long range, he's no good up close.
Now... The question is, "How do I get close to him?"

Storm Mutant (Skeleton): How many times has this happened to you? You're walking around, and then a Suicide Mutant blows you up. All of your stuff is dropped. So, you rush to go grab it again. Then, you realize, it's all gone.
Well, not anymore! If you die, the Storm Mutant will stop on by, and guard your stuff for ya! He's so good at his job, that he won't let anyone get it, even you! Isn't that great? Oh, almost forgot... He likes to strike people with lightning.

Suicide Mutant (Creeper): Well... It pretty much does what the name inclines. He runs at you, then blows himself up.

Leaper Mutant (Spider): We built a bigger, faster, stronger Mutant, just for you! And he goes by the name, Leaper Mutant!

Jumper Mutant (Cave Spider): You might be thinking, "BlackJacket, what's the difference between a Leaper and a Jumper?"
Well... I'll tell ya! The Jumper has much more speed, and agility. Your average Leaper Mutant wouldn't be able to keep up.

Blob Mutant (Slime): Radiation can mess you up. Use the Blob Mutant as an example. His face is made of slime, and...
If you come anywhere near him, he'll poison ya, and make you act all crazy. See what I mean?

Ender Mutant (Enderman): Again... The name pretty much says it all. He's an Enderman Mutant. Not much else.

Stinger Mutant (Silverfish): This little guy is so small and fast, that he can out run almost any Mutant out there.
Yep, he's pretty annoying.

Frost Mutant (Snow Golem): Everything this guy touches, turns to ice, but other Mutants never liked him.
So... He decided to freeze all of them, but they fought back. They tore him apart, but you can put him back together!
All you have to do is put a Pumpkin on top of two Snow Blocks. Easy, right?

Scorch Mutant (Iron Golem): He too, like the Frost Mutant, was hated by other Mutants, because he had the power to remove the life from everything. He touches something, boom, it's all dried out and useless.
Because the other Mutants were so mean, he caught them all on fire. He was torn apart, just like the Frost Mutant.
Want to help him out? Just put a pumpkin on top of a T made out of Iron Blocks. Then he'll help ya out!

Nether Mutant (Wither): The dark one himself. Everywhere he goes, he brings the underworld to where he stands. He is the fastest, strongest, most powerful Mutant ever created! Think you can kill him? Well... All you have to do is put three Wither Skulls on top of a T made out of Soul Sand. Are you ready for him?

Renaming Mobs: All of the Mutant abilities are created by thier names.
Meaning, you can give the Mutants' abilities to other mobs.
All you have to do is rename a mob with the name you want (Scorch, Jumper, Ender, etc...), and that mob will get that Mutant's abilities. Sounds cool? That's because it is!

Terrain Editing Mutants: Some of the Mutants have the ability to change the terrain (Scorch, Frost, & Nether).
These Mutants can morph the terrain into what thier name implies. Frost=Snow, Scorch=Desert, & Nether=Nether.
All of the Zombie abilities apply to Players, with the exception of Terrain Editing Mutants.
Terrain Editing Mutants' abilities only apply to the terrain, and other Mutants. (Nether gives the WIther effect to Players, etc.)