system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do people and animals (maybe all mammals) crook their head to the side when they think about or are confused about something?
gpt
Humans don't do it.

But some animals do, such as dogs, cats, birds. They tilt their head when they hear a sound that grabs their attention. That's because, unlike humans, these animals don't have the complex wrinkled outer ear that would allow them to determine not only the horizonal position of the sound source, but also vertical.

They get around this disadvantage by tilting their head and placing one ear above the other.