A seven-year-old male Javan rhinoceros enjoys a mud bath in Ujung Kulon National Park in Banten, Indonesia, June 5, 2020, in this still image from video obtained via social media. Video taken June 5, 2020. A rare Javan rhinoceros has been captured on surveillance camera gleefully rolling around in the khaki, tropical waters of Ujung Kulon National Park, on the westernmost tip of Indonesia's Java island. Ujung Kulon National Park via REUTERS

A seven-year-old male Javan rhinoceros enjoys a mud bath in Ujung Kulon National Park in Banten, Indonesia, June 5, 2020, in this still image from video obtained via social media. Video taken June 5, 2020. The 30 second long video of the endangered Javan rhino, or Rhinocerus sondaicus, one of only 72 left in the wild, was posted by Indonesia's Environment Minister Siti Nurbaya Bakar and has gone viral on social media. Ujung Kulon National Park via REUTERS

A seven-year-old male Javan rhinoceros enjoys a mud bath in Ujung Kulon National Park in Banten, Indonesia, June 5, 2020, in this still image from video obtained via social media. Video taken June 5, 2020. Javan rhinos, which once lived through northeast India and Southeast Asia, are among the most threatened of the five rhino species. Ujung Kulon National Park via REUTERS

A seven-year-old male Javan rhinoceros enjoys a mud bath in Ujung Kulon National Park in Banten, Indonesia, June 5, 2020, in this still image from video obtained via social media. Video taken June 5, 2020. Ujung Kulon National Park via REUTERS