Features: This add-on utilizes many different skins either personally made, or edited/taken from Nova Skin. The random mobs are possible with features from the latest Optifine, including biome specific mobs. Just add it to the top of your Selected Resource Packs and it will work with any other texture pack. Make sure Random Mobs are turned on in your options, under the quality tab.
When a pig get struck by lightning it turns into a Zombie Pigman. So what happens to wolves or cows? Duh! Werewolves and Minotaurs, that's what!
Zombie werewolves: Found in Forest, Taiga, Cold Taiga, Cold Taiga M, and Mega Taiga
Zombie Minotaurs: Found in Birch Forest Hills M, Birch Forest Hills, Savanna, Extreme Hills Edge
What other nasty creatures can be found? How bout the nasty reptiles of the swamp?
Gator Zombies and Skeletons:
Desert Biome mobs: Mummys, Pharaohs, Undead Pirates, and other scary monsters.
Plenty of other overworld mobs like Snowy Biome Creepers, Zombies, and Skeletons. Slimes that look like Melon and Pumpkin Blocks. Skeletons that look like Robin/Link, and more, like lots of different villagers.