Red cedar, native to this area, provides food and shelter for birds and mammals, but it is also very invasive in grasslands. Within just a few years without fire (which used to occur naturally) or mechanical removal, cedar trees will monopolize an open, grassy field and change the entire ecosystem. They are commonly found along fence rows – deposited there by birds who have eaten then deposited the seeds. Although slow growing, cedars can become very large and live for a 100 or more years. Refuge staff and volunteers are working to remove cedars from prairie restoration sites.