If it’s brown, lie down. If it’s black, fight back. If it’s white, say goodnight.
The rhyme we learned hiking as a family through Yellowstone national park last summer is meant as a cheery reminder of how not to get eaten, if you meet a bear. Brown bears are best appeased by playing dead; black bears need to know this will hurt them more than it hurts you; and luckily there aren’t any polar bears in Yellowstone, because nothing deters them.