Imagine standing next to a penguin taller than NBA legend Michael Jordan. It may seem ridiculous to think about today, but it was once possible. The colossus penguin (Palaeeudyptes klekowskii) stood at a staggering two meters in height. This enormous penguin lived with several other penguin species in prehistoric Antarctica. Due to its size, it could probably hold its breath for longer periods than other penguins, and may have hunted underwater for up to 40 minutes at a time.