Seven Rivers Christian School students listen as Peter DeRosa, 17, talks about the bones of a Colombian mammoth on display at the private school. The bones were found along the Peace River near Arcadia and are traveling Citrus County in an exhibit sponsored by the Creation Science Institute. The bones will be displayed today until 6:30 p.m. at the Calvary Christian Center in Inverness. The DeRosa family lives in Crystal River and works for the institute. They helped excavate the bones discovered in 1996. Two other mammoths have been found within 100 feet of the first, leading the institute to believe there may have been a herd of mammoths at the site. The mammoth on display is a juvenile, more than 12 feet tall. Adult mammoths grew to 15 feet. The ivory tusk on this mammoth is 60 inches long. A femur bone is 53 inches long and 9 inches thick.