What does a duck and rhinoceros have in common?

This is a bit of a trick question! Ducks and rhinoceroses are very different animals. Here's why it's tricky and some possible answers:

* They are both animals: This is the most basic commonality.

* They both have a sense of smell: While a rhinoceros' sense of smell is incredibly strong, ducks also use their smell to find food.

* They both live on Earth: This is obvious, but it highlights the shared environment they inhabit.

The real trick is that there isn't a particularly interesting or obvious connection between them.

Perhaps you're looking for a more creative answer? Do you have a specific thought in mind?