A new species of big cat has been found living in the rain forests of Borneo. It's also found on the nearby island of Sumatra. The two types of cat have different markings on their fur, as well as other smaller differences. The Borneo Clouded Leopard can grow as big as a small panther. Because it's mostly found on Borneo, experts say this new discovery highlights the need to protect the island's rainforests.