Evolution didn’t bother fixing what was never broken.

We tend to think of evolution as this nonstop process—creatures adapting, transforming, becoming smarter, faster, or stranger over time. But not everything follows that script. Some animals hit their peak millions of years ago and haven’t budged since. Not because they’re lazy, but because their design was already so effective, nature just stopped tweaking it.
These aren’t just survivors. They’re biological time capsules, still here doing things the same way they did back when woolly mammoths were considered new. Here are 12 creatures that skipped the updates and still run on their original operating system.