It’s something most of us do every morning without a second thought. We wake up, stumble to the bathroom and glance at ourselves in the mirror as we wipe the sleep from our eyes. It may not seem like much, but the simple act of looking at that mirror—and understanding that the eye-rubbing person staring back is really one’s own reflection—demonstrates a remarkably sophisticated level of understanding.
Image: A cleaner wrasse interacts with its reflection in a mirror placed on the outside of the aquarium glass. Credit: Alex Jordan
