Until the discovery of the Callao Man, archaeologists used to believe that it was the Tabon Man who was the oldest and earliest man to have lived in the Philippines. The fossils of the Callao’s remains was discovered in Cagayan in Penablanca in the Callao Caves. It was found by Armand Salvador Mijares in the year 2007. The discovery has produced a metatarsal, a group of bones which are located in mid and hind foot and somewhere near the toes. This metatarsus was about Sixty millimeters long. The find was dated through the use of a uranium series ablation, the most accurate dating method used by archaeologists. The results of the uranium shows that the bones were about 60-67,000 years old. If they were to prove the bones to belong to the Homo Sapiens then it would beat the Tabon Man and earn its place in the list as the earliest remains of man to be found in the Philippines. It also has the chance of being the oldest not only in the country but in the whole of Asia Pacific. Researchers has noted that the Callao Man had an average height of 4ft tall. Researchers also believe that their descendants could be the Aetas who live in the mountains in the present in the Philippines. This is because of the possible features that emanate from their study of the metatarsal which suggests short height, curly hair and dark skin. But the classification in terms of the biological of the Callao man became uncertain in July of 2010. This is because the metatarsal that was discovered was found out by researchers as belonging to the Homo genus species. These researchers speculate that Callao Man could either belong to the Homo florsiensis or the Homo Sapiens. Homo florsiensis are species which are distinct from men that is usually short in height and resides mostly on the islands of Indonesia. On the other hand, the Homo Sapiens are what is now known as the modern type of men. The researchers were becoming unsure of the genus of the bones due to the fact that they haven’t yet discovered a skull to fit the metatarsal. But Mijares was able to stress that the Callao Man was most probably an individual that has a small body. Theories show that the Callao Man and his group of humans originated from the country of Indonesia and came to Luzon by way of a raft. The researchers have noted that this theory fits to dated existence of the Callao Man when humans were not yet capable of travelling long distances and voyages. This glaciations created isthmuses or land bridges that connected islands from other islands. According to the theory during the times of the Callao Man there were isthmuses that connected Philippines to all of Southeast Asia. In the present day, there have been no other researchers to find more on the bones of the Callao Man except those of Mijares’ group from the University of the Philippines.