different types of birds have different needs. their wings have evolved to suit their lifestyle. large birds of prey, such as eagles, spend a lot of time soaring on the wind. they have wings that are large and broad. the main flight feathers are long and wide. they help the eagle to stay on rising air currents without using much energy, while the eagle looks at the ground below, to find the next meal. when the eagle sees some small creature move, it can close its wings and fall from the sky like a missile, opening its great wings again to slow down as it comes to land. the world's largest eagle, the philippine eagle has a wingspan of about 2 m (6.7 ft) wide.