Known as “the Wall,” this theatrical expanse of #cliffs in South Dakota cuts through #Badlands National Park, a rich natural repository for #fossils, including ancient #mammals like the saber-toothed #cat. Many #animal #species that have adapted to #climate extremes via burrows, hibernation, and #canyons now live here. #photooftheday #science #photography #view #mountains #nature #beauty 📷: GettyImages/stevegeer