Divers in Florida made a monster find on Sunday (May 2): A 4-foot (1.2 meters) mammoth leg bone.
The divers, Derek Demeter and Henry Sadler, found the 50-pound (22.7 kilograms) bone in the Peace River near Acadia, Florida.
"Henry is my dive buddy," Demeter, who is the planetarium director at Seminole State University, told Fox 35. "He yelled out to me, said, 'Hey, Derek. I found something!' Oh my goodness!' It was really, really cool."
The two friends dive regularly in southwest Florida, and they have previously found mammoth teeth in the river. The same day they discovered the leg bone, they also found several small fossils from extinct sharks and the tooth of a saber-tooth cat, they told the news station. The new mammoth bone was buried in a layer of sand. Its age is unclear, but Columbian mammoths (Mammuthus columbi) roamed as far south as Costa Rica during the last Ice Age. In 2011, scientists confirmed that fossils found on Vero Beach in southeast Florida were mammoth bones from about 13,000 years ago. The Columbian mammoth was probably a hybrid between the woolly mammoth and an unknown lineage of mammoth that arrived in North America from Siberia around 1.5 million years ago, according to recent DNA research.
The new bone is a mammoth femur, or thigh bone. The animal it belonged to could have grown up to 14 feet (2.25 m) tall and could have weighed up to 22,000 pounds (10,000 kg).
The amateur archaeologists have donated several finds to the Florida Museum of Natural History. Sadler is keeping the bone in the middle-school classroom where he teaches in order to engage kids in the ancient history of Florida.
"It's currently sitting in the classroom where the kids are able to see it, touch it, feel it and really get a history of the natural world," he said.
Originally published on Live Science.