Does a bird migrate long distances? Odds are, it has long wings. Or perhaps it prefer to walk or run—you can predict it will have long legs. Birds that swim—diving ducks, coots, auks, penguins, dippers—tend to share the same body shape, and if they catch fish, their beaks are similar too. Many Alcids (auks, murres, puffins, and guillemots) and penguins are shaped pretty much the same, and some even have the same coloring, though they’re poles apart.