The least tern is the smallest tern that makes its nest along the beaches of the Gulf area. Sadly, the least tern is already endangered and the oil spill may end up wiping out the remaining population. This once plentiful bird now numbers somewhere around 2,000. Work is being done to try to save the least tern, with wildlife biologists helping to protect the vulnerable eggs from the crude oil. With a 40-day period required for hatching and nesting, the least tern faces long odds as a result of the oil spill.