The oozlum bird is a made-up creature from old stories that people used to tell. It is said to be a very silly bird that would get so confused about where it was going that it would fly in circles and end up flying backwards. Some stories say that the bird would even fly so high that it would fall back down to Earth, like it was doing a silly dance in the sky.
Of course, this bird isn't real - it's just a fun and silly idea that people liked to talk about a long time ago. Today, people might use the idea of the oozlum bird as a way to talk about someone who is getting lost or confused, or who keeps making the same mistake over and over again. But remember, it's just a silly story!