"Collecting fresh faecal samples is not as easy as it may sound," says researcher Sanjeeta Sharma Pokharel.
But her efforts have helped scientists in India devise a unique, non-invasive way to monitor the physiological health of wild elephants.
The key has been freeze-drying dung in the field to preserve the elephant's hormones.
As a result, scientists found stress levels in females were more conspicuous than in male elephants.
Over five years, Sanjeeta and her colleagues collected more than 300 samples from 261 elephants in the biodiversity-rich Western Ghats area.
She explained her technique: "I used to hide and observe till the elephant defecated and moved away."
She told the BBC: "These samples mean a lot to me.-read more
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