Shoebill storks are large wading birds from East Africa known for their massive shoe shaped bills, intense stare and distinctly prehistoric appearance. Their bill clattering display, used in greeting and at the nest, went viral in short animal clips where viewers compared the rapid rattle to a machine gun. The nickname dino with a gun stuck because the bird looks like a small dinosaur and sounds armed. It remains popular in meme edits and reaction videos that play that appearance against the unexpected noise.