SMH - Researchers in a remote jungle in Indonesia have discovered a giant rat - five times the size of a typical city rat - and a tiny possum that are apparently new to science. Unearthing new species of mammals in the 21st century is very rare. The discoveries by a team of American and Indonesian scientists are being studied further to confirm their status. The animals were found in the Foja mountains rainforest in eastern Papua province in a June expedition, said US-based Conservation International, which organised the trip along with the Indonesian Institute of Science. "The giant rat is about five times the size of a typical city rat," said Kristofer Helgen, a scientist with the Smithsonian Institution in Washington. "With no fear of humans, it apparently came into the camp several times during the trip." The possum was described as "one of the world's smallest marsupials".