One of the last "big tusker" elephants in Africa has been killed by poachers. Satao II, one of the oldest and biggest elephants on the continent, is believed to have been struck by a poisoned arrow; he was found dead Monday, before poachers could take his ivory. The elephant, about 50 years old, lived in Kenya's Tsavo national park. "Tuskers" are so named because of their imposing tusks, which almost scrape the ground; Satao II's weighed in at more than 110 pounds apiece. There may be as few as 15 tuskers left in Kenya and just 25 worldwide, the Guardian reports. Two suspected poachers have been apprehended in connection with Satao II's death. (More poachers stories.)