Some species of hummingbird are adapting to urban life by undergoing evolutionary changes in their anatomy, influenced by the proliferation of artificial drinking fountains. A recent study found that the size and shape of the beaks of Anna’s hummingbirds (Calypte anna), a species native to North America, have changed. A hummingbird’s beak is naturally long and slender in order to access nectar located in deep inside flowers. Populations of these hummingbirds expanded northward in California at the same time as the establishment of urban centers where feeding could take place. According to the study, Calypte anna populations in 1930 were very different from those in 1950, when the birds’ bills had already begun to grow.