This document discusses what can cause habitats to change, including natural causes like drought, flood, and fire as well as human impacts. It notes that drought causes habitats to become dry, flood covers the ground in water, and fire can destroy forests. Animals like beavers also change habitats by building dams and ponds. While some animals can adapt to habitat changes by finding new places to live or changing behaviors, other animals cannot adapt and may die off or become endangered when their habitat is altered.