Not all birds possess the ability to fly; in fact, there's a good number of birds who can't. The specific reasons vary between each flightless bird, but the most common explanation boils down to their wings are not made for flying.

Despite this, there are plenty of times in media in which a bird that shouldn't be able to fly actually does. It could be just one of its kind, or the entire breed. In any case, if you see any birds known to be unable to fly in any source of media showing the ability to fly, they belong on this list.