On a moonlit beach at the Wanan islet off southwest Taiwan, a group of tourists gather patiently to watch a green turtle using her flippers to cover the eggs she has just laid in the sand.
The tourists count themselves lucky as the sea turtles, an endangered species in Taiwan, come to the beaches of several offshore islands for nesting for only a few months each year.
And when dawn breaks a few hours later, they watch as researchers attach a tracking device to the back of one turtle before she slowly makes her way across the beach and vanishes into the ocean.
"It's quite a unique experience to see a huge sea turtle coming ashore to nest. I have never seen an endangered animal before," said Linda Wu, who joined the eco-tour in Wanan, part of some 100 islets of the Penghu archipelago in the Taiwan Strait.
Wu, a secretary from Taipei, has been so impressed by the visit that she is planning to bring her 11-year-old daughter to Penghu next year.
"Eco-tours can provide a good opportunity for children who grow up in the city to learn something about nature and experience outdoor living," she said.
The turtle sighting is the latest of a variety of tours attracting nature-loving, ecology-minded tourists to some of Taiwan's remotest regions.
Such tours boast the island's unique landscape and rare animals with programmes such as trekking across volcanic rocks, watching migratory birds and butterflies, or fishing in lagoons.