What do owls hooting in daytime mean?

There are many superstitions surrounding the hoot of an owl during the day, most of which point to an evil premonition or death. This is also present in literature, an example being when a hooting owl in broad daylight in Julius Caesar was one of the several symbols of Caesar's coming death.

In reality though, a hooting owl during the day is merely a rare occurrence and not entirely impossible. Hooting is just an owl's way of communicating with other owls, whether it being during the night or day.