Save the Rhino Day: At least five species of rhinoceros exist; all are endangered. People kill them for their horns. However, the horns are nothing but chunks of keratin, the material found in hair and nails. A rhino can grow to a length of fourteen feet and weigh as much as four tons. These animals are shortsighted but have keen senses of smelling and hearing. All rhinos are herbivores but will attack people if they feel especially threatened. Ancestors of present-day rhinos date back to the prehistoric times. Their thick skins act as armor to protect them from enemies. Idea: Cut lengths of paper 14 feet long, the length of a rhino. Have children draw rhinos on the paper. Fill the paper with rhino facts students have gleaned from research.