Common Terns are marine, pelagic and coastal migratory birds that breed in Siberia. Found in all Australian waters from late August through to April.
In Australia, it is recorded in all marine zones, but is commonly observed in near-coastal waters, both on ocean beaches, platforms and headlands and in sheltered waters, such as bays, harbours and estuaries with muddy, sandy or rocky shores. Common Terns mainly eat small marine fish, but will also take crustaceans and aquatic insects.
When fishing, it flies above the water with bill pointing downwards. On sighting fish it drops with partly closed wings and enters the water with little splash, usually submerging completely, and emerging a moment later, shaking off the water as it flies.