
What is a Hybrid? A hybrid is a bird or animal that is produced by the crossing of 2 creatures that are not the same. This can happen naturally, but is far more likely to happen at the instigation of human beings.

What is a Mule? A mule is a hybrid that is not fertile. In theory this is the majority of hybrids. And type wise this is probably so. But because some different but closely related types of birds are more likely to be accidently or intentionally crossed mules may not be the result of these close crosses. e.g. Lonchura species.

What is a Mutation? Now this is different entirely. Mutations are natuarlly occuring changes within a species. Some mutaions thrive because they are better adapted to the environment in which they occur, or are helped by peoples possative reaction to them. And some rapidlly die out because they are weak or just don't take or appeal to people.

Look forward to other people input and oppinions.

LML