Asteroid 349507 (2008 QY) is around 1.2 kilometers in diameter, or around 1,000 capybaras – large enough that an impact event (which won't happen now) could be a worldwide catastrophe.
While the asteroid is traveling too far to pose any risk to the Earth, a possible impact event with it could become a worldwide catastrophe.
I don't think they know how volume calculations work. When I read 1000 Capybaras, I though "huh, that's not actually that big", until they say it's actually the diameter or that much capybaras.
EDIT: I did some pocket calculations and it seems like 1000 capybaras can fit into an around 13 capybara diameter sphere.