In this undated photo released by the WWF-Indonesia, a scientist measures a footprint which is believed to be of a Sumatran rhino in a forest in Kutai Barat, East Kalimantan province, Indonesia. The WWF-Indonesia said that they have discovered several footprints believed to be from the critically endangered species on Indonesia's Borneo island. (AP Photo/WWF-Indonesia) NO ARCHIVE, NO SALES

Associated Press
In this undated photo released by the WWF-Indonesia, a scientist measures a footprint which is believed to be of a Sumatran rhino in a forest in Kutai Barat, East Kalimantan province, Indonesia. The WWF-Indonesia said that they have discovered several footprints believed to be from the critically endangered species on Indonesia's Borneo island. (AP Photo/WWF-Indonesia) NO ARCHIVE, NO SALES
In this undated photo released by the WWF-Indonesia, a scientist measures a footprint which is believed to be of a Sumatran rhino in a forest in Kutai Barat, East Kalimantan province, Indonesia. The WWF-Indonesia said that they have discovered several footprints believed to be from the critically endangered species on Indonesia's Borneo island. (AP Photo/WWF-Indonesia) NO ARCHIVE, NO SALES
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