Dolly Priatna fits a GPS collar to a Sasa prior to translocation

Dolly Priatna fits a GPS collar to a wildcaught Sumatran tiger prior to translocation © Bastoni

The collar transmits several times every morning - but not too often, to save on battery power. It also lets us know if Sasa didn't move for a long time, in case something had happened to him - this is called a "mortality signal".

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