Kaziranga chief NK Vasu said the maiden drone flight on Monday was a "milestone in wildlife protection".

BBC: India deploys drones to save rhinos in Assam state

Ms. Vasu-Devan, 28 years old, spent her summer there and joined the group's program-related investments arm full-time after graduation last year.

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"To keep it this way, it is important to guard every inch of land inside the park, " said Niranjan Kumar Vasu, the park's director.

WSJ: Armed Guards, Drones to Protect India's Rhinos