Cuckoos are summer visitors to Europe from tropical Africa. They arrive between mid-April and early May, when you can hear their well-known cu-ckoo call in most parts of the countryside.
Adult Cuckoos are among the earliest of our summer visitors to leave. They have no need to help rear their young, so they are free to go. Most leave Europe during July. Young Cuckoos leave about one month later, when they are fully fledged. They never see their parents.
We don’t know much about Cuckoo migration routes. They probably travel down through central Europe to the south of Italy, where they feed up before crossing to Africa. In Africa, Cuckoos never call, so most probably go unnoticed.