The Curlew Sandpiper is a migratory species from the Northern Hemisphere, moving south to Australia, Africa, the Persian Gulf, India and South-east Asia. It arrives in September and returns in April. Some birds, usually juveniles, overwinter in Australia. According to the Australian Wader Studies Group (AWSG), a flagged (marked with a tag) Curlew Sandpiper was sighted in Sri Lanka on 20 August 2005. This is the first Australian wader ever to be reported from that country and suggests that the migration route of this species extends further west than originally thought.