Borneo’s orangutan population has declined by more than half since 1999 due to palm oil production and logging, a study has found. Between 70,000 and 100,000 of the endangered primates remain in the wild on the island, Current Biology journal found. Indonesia is infamous for the appalling treatment of orangutans. The Indonesian police arrested four farmers last week for allegedly shooting a Bornean orangutan whose body was found riddled with 130 air gun pellets. The oil palm boom of the 1970s kicked deforestation into hyperdrive. It began in Malaysia and by the 1990s spilled over into neighboring Indonesia. Together the two countries account for 80 percent of the world’s palm oil.