Flightless birds
The benefits of flight are all about being able to live on a much wider geographical scale than land-based animals. This is seen to its best with migrating birds, who live their lives in two different latitudes, and get the best from each. The usual system is to lay their eggs and raise their young in one place, and do most of their growth in another place. Even birds which do not migrate do benefit from flying to find nest sites and get their food. Apart from foraging for food, the main benefit of flight is to avoid many of the predators which eat land-based animals.