Bats n Stuff

Bats are now not just a mob that drops nothing and isn't useful, Basically, bats can now bite, but only a 1-10% chance of them to bite DEPENDING on the location, If the bat is located in a forest, its usually a 5 percent, jungle 10, After a few days without taking a mundane potion/milk, they will have fatal poison, which is incurable unless they take 3 milk buckets or 1 honey. 

Same with dogs/wolves, cats, but it will be 1-5% in any location,

After 7-10 days the mob will perish.