Question

What type of Literary Devices is this passage and provide an explanation

Wilson and I are different species: he’s an early bird and I am a night owl. The problem is if I move him to his own cage, who will I get to clean up the droppings?

Answer 1

Since the speaker compares himself to a night owl and Wilson to an early bird without the usage of the words "like" or "as", this is an example of metaphor. The reader is obviously not actually a night owl, but is merely saying that he's more active at night.