system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can a dog have one ear that stands straight up while the other is wonky?
gpt
Dogs have well-developed muscles that control their ears and allow them to point them around with precision, like little radar dishes. Pointing one straight up allows them to listen specifically in a certain direction without turning their head.

Humans also have muscles for their ears, they're just incredibly weak because we've evolved a lot since we had manual ears. This is why some people can wiggle their ears.