What is defined as a 'passage bird'?

A 'passage bird' refers specifically to a raptor that is less than one year old and has left the nest. This stage in a bird’s life cycle signifies that it is still in the early phase of its independence, having just transitioned from being dependent on its parents to fending for itself in the wild. This classification is important in falconry and bird conservation as it helps differentiate between various age groups and their behaviors, particularly in relation to hunting and training. By understanding that a passage bird has recently fledged, falconers can tailor their training methods and expectations accordingly, knowing that these young birds may still be developing their skills and instincts.