The site is critical for the survival of several species of endangered waterbirds, to which the key threat is large-scale egg and chick collection by villagers.

UNESCO: OFFICE IN PHNOM PENH

If the egg which is now being incubated hatches, a chick can be expected in the next five or six weeks.

BBC: 'Oldest' breeding osprey lays 62nd egg at Loch of the Lowes

Ideally, when a chick becomes a candidate to become an egg-laying hen, it is put in a clean environment with clean water and feed, he said.

CNN: STORY HIGHLIGHTS