Winter brings big changes to the birds of the New South Wales South Coast. The Cuckoos have long left, in March and April, flying north to as far as Papua New Guinea. The migratory waders have left too, for their long journey to the northern hemisphere breeding grounds. Honeyeaters head north to warmer climes, forming large flocks that can be seen flying over Sydney and swooping through the passes of the Blue Mountains. Other birds arrive; Robins leave the mountains of the great divide and head to the more temperate coast. Other birds migrate north from as far south as Tasmania.