Most people think of ornithomimids as swift, ostritch like dinos that lived on plains and grasslands, like they were seen in Jurassic Park. But new fossils show that these dinosaurs had true duck bills, like a bird, and probably filtered their food out of water instead of hunting. The fact that their remains are generally found in wet, swampy locations helps confirm this new theory. If this theory is correct, these dinosaurs will be the largest known land animal to 'filter feed', as they may have topped 1000 pounds. Read the National Geographic article and see photos.