Many young birds will leave the nest and spend several days on the ground while they are learning to fly. This process is called fledging, and birds of this age are called fledglings. Fledgling birds will usually have mostly smooth adult feathers with a few fluffy feathers. They should be bright and active and may be calling out. You might see them flapping and jumping, although they may not seem to be able to fly at all. The parent birds should be close by monitoring the fledgling and may be bringing it food occasionally.
Unless they appear injured or in danger (e.g. from traffic or domestic pets) fledgling birds should be left alone.
If you think a bird you have found might be a fledgling but are unsure, please contact WIRES on 1300 094 737 or your local veterinary clinic for more advice.