A six-foot flightless bird with a dagger on each foot that could genuinely ruin your afternoon.
Fun fact: Their inner toe claw grows up to 12 centimeters long and can disembowel a human with one kick.
Going back and forth in a lane sounds dull but they've managed to make about forty Olympic events from it.
Fun fact: "Native American swimmers demonstrated the front crawl in London in 1844, but the British dismissed it as ungentlemanly."