an adult white gull-billed tern (gelochelidon nilotica) in non-breeding plumage sitting on a rock

adult animal animals avian background beach beak beautiful bill bird birds blue brown close closeup elegant environment fauna feather feathers finch flight flying gelochelidon great gull gull-billed heron lake lanka large life migrant natural nature nilotica non-breeding ocean outdoor outdoors plugame plumage pond reflection rock sea seabird seagull shorebird sitting sky small sparrow species sri tern wading watching water waterbird white wild wildlife wing wings