Strays

An artist is a sheep that strays from the flock.

We've got three cats in the house, and we're also feeding a few strays.

English is an unstandardized language. It has a set of de facto rules. Colloquial English strays far enough from literary English that it could be considered broken. In literary English, we say, "About what is your book?" but colloquially, "What is your book about?" It is broken as it is.