Some species Hummingbird adapts to urban life by passing evolutionary changes in their anatomy, under the influence of proliferation of artificial drinking fountains. According to some biologists, this may show that these birds are on the road to standing Commensal With the fact that people “use a strict life next to them – like pigeons in urban areas.
AND Last examination stated that the size and shape of the beaks of Anna’s Kolibra (Calypt Anna), a species from North America has changed. Hummingbird day is naturally long and slender to access the nectar in deep in flowers. However, in recent decades, the nuclid beaks of Anna’s cities have evolved so that they are much longer and larger, to better access the drinking fountains installed outside houses that have spread in urban areas. This adaptation suggests that these feeders offer co -bolibers more food than flowers filled with nectar.
The study in which it concerned reported observations of birds, as well as museum specimens from the last 160 years, also showed that men are developing sharper, more pointed beaks, perhaps in order to compete with other collaibers to gain access to these fontans filled with sugar.
The populations of these kolibers expanded to the north in California at the same time as the establishment of municipal centers in which feeding could take place. Scientists have found that the population density Calypt Anna Over time, it has increased and it was found that it seems that it is associated with the proliferation of nutritional fountains and producing eucalyptus trees that were introduced to the region by people.
These morphological changes in Kolibers appeared quickly. According to the study, Calypt Anna The populations in 1930 were very different from the demand in 1950, when bird accounts began to grow. In just 20 years, equivalent to about 10 generations of these birds, evolution left its sign, the authors notice.
To conduct research, the team used viewing data for the species in all 58 California counties in 1938–2019, in addition to analyzing samples preserved in museums. They also turned to old newspapers to estimate the number of used feeders over the past century. Finally, they developed a calculation model to predict the Hummingbird expansion, taking into account the support and presence of eucalyptus trees.