What is a difference between alligators and crocodiles?
A difference between alligators and crocodiles is the shape of their heads. Crocodiles have more narrow and longer heads than alligators.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: What is a difference between alligators and crocodiles?
### Input: 
### Response: A difference between alligators and crocodiles is the shape of their heads. Crocodiles have more narrow and longer heads than alligators.