London, July 27 - Human impact on one of the world's most threatened bird species could save it from extinction, says a new study.

The study by University of East Anglia (UEA) conservation experts explores the exact reasons behind the decline of the critically endangered white-shouldered ibis.

Funded by the Royal Society for the Protection of Birds (RSPB), the new study was carried out in northern Cambodia, where 160-200 of the birds survive -- around half the global population.

Working in partnership with BirdLife International, the researchers found that the ibis prefer to forage in open and accessible sites with low vegetation and bare soil.

This is believed to be because it makes it easier to find prey, aid with take-off and landing, and improve detection of approaching danger.

Traditional small-scale farming by local communities is therefore crucial to the ibis' survival because grazing livestock and burning of the forest understorey opens up these habitats making them suitable for the birds.