There are more than 1.5 million known zoological species on Earth, with at least as many unanswered questions. From why snakes lost their legs to how certain animals survive extreme conditions, nature holds endless enigmas.
Here are our top ten mysteries. Why did snakes lose their legs? Scientists believe it was an evolutionary trade-off for better slithering efficiency in varied terrains. Another puzzle is how the whale shark, the largest living fish, filters such vast amounts of water without swallowing too much plankton. The immortal jellyfish, *Turritopsis dohrnii*, can revert back to its juvenile stage after aging, defying death.
Why do some animals have ultraviolet vision while others cannot? The mantis shrimp possesses the most complex visual system in the animal kingdom, seeing both visible and ultraviolet light. These questions remind us that despite centuries of study, countless secrets remain hidden in the natural world.
Source: New York Times Top Stories · Summarized by HeadlinesBriefing