A roost of several thousand Pacific flying foxes hanging in the casuarina trees along the road through Kolovai village, half a kilometre inland from the beach. The bats are large — half a metre across with the wings open — and the colony is visible day and night, but the dusk fly-out is the moment.
You can walk up to the trees and stand directly below the roost. The bats chatter, fight, and groom in the late afternoon; at sundown they leave in waves to feed on fruit across the western half of Tongatapu. The viewing is free and the village families have come to expect curious visitors. Keep a hat on — flying foxes leave droppings.