 Hummingbirds do not spend all day flying, as the energy cost would be prohibitive; the majority of their activity consists simply of sitting or perching.Hummingbirds eat many small meals and consume around half their weight in nectar (twice their weight in nectar, if the nectar is 25% sugar) each day.Hummingbirds digest their food rapidly due to their small size and high metabolism; a mean retention time less than an hour has been reported.