Yes, rats do have lips, but their upper and lower lips differ.
Rats possess a unique lip structure:
- Upper Lip: Rats have a cleft upper lip. This cleft is also known as a philtrum.
- Lower Lip: The lower lip of a rat is intact, meaning it doesn't have a cleft.
Therefore, while they don't have lips in the same way humans do (with two complete lips), rats do indeed have a lower lip and a specialized upper lip. The shape of their mouths is influenced by the requirements of their dentition, which keeps their incisors sharp.
