It's hard enough running a marathon's 26.2 miles, but going the whole way in a 22-pound rhino costume is another beast entirely.
The suits have become a symbol for the organization and were first introduced in 1992 at the London and New York marathons. They've since been to Paris, Dublin, Boston and the top of Mt. Kilimanjaro.
Rhinos have been having a tough time lately -- some 633 were killed in South Africa alone last year. Their horns are considered a cure-all medicine in some Asian countries and there's still a demand for hunting trophies.