The sky update

Minecraft's overworld's sky is so much empty. Why not adding birds. For instance, sparrow (it can be the fastest flying thing, catching it will be so difficult that if you manage to shot one you will get an achievement....), crow (they will have their nest and the will steal shiny things from you, hit one and others will attack you like the bee in Minecraft), ostrich (a big land bird which can run so fast)