Forest damage resulted in Balikpapan being easily hit by floods and landslides when it was hit by heavy rains. Clean water supply is also decreasing because water absorption is narrowing, erosion is easily to occur and sediment from mining sites that flow into the river worsens and lowers reservoirs, coupled with Balikpapan conditions has few rivers and less fertile land. The population of the Balikpapan's mascot, the sun bear is fewer and only 50 are left. This is due to coal mining which narrows the habitat of sun bears, so its are reluctant to reproduce. In addition to sun bears, other Balikpapan animals that are declared endangered are proboscis monkeys, borneo gibbon, bornean orangutans, pangolin and otter civet. Whereas extinct animals in Balikpapan are Bornean Banteng ("Bos javanicus lowi").