Off the back of the ferry that took us from Koh Samui to the mainland of Thailand, a flock of Black-naped terns followed in our wake. They were collecting all of the bits and pieces that would surface in behind the boat. We never did get a good look at what they were eating, but the flock of 30 plus birds followed us for 10 minutes. Black-naped terns are found in either side of the equator in South East Asia and Polynesia.