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Some types The hummingbird adapts to urban life by undergoing evolutionary changes in its autopsy, and is affected by the spread of artificial drinking fountains. According to some biologists, this may show that these birds are on their way to become Comminsal With human beings – in order to live closely alongside them – like a bathroom in urban areas.
A A recent study I found that the size and shape of the tannal bird beak Anna (Anna Cast) The type of home may change in North America. The hummingbird beak is long and where naturally to reach the nectar in the depths of the flowers. However, in recent decades, the bunny bird beak has evolved in Antan Anna to be much longer and larger to reach sugar drinking fountains that were installed outside the houses, which spread in urban areas. This adaptation indicates that these nutrients provide tonn birds more than the flowers filled with nectar.
The study, which looked at the reported scenes of the birds as well as the museum samples from the past 160 years, found that males are developing a more clear beak, and perhaps competition with other tanna birds to reach these fountains filled with sugar.
The inhabitants of these tannal birds expanded north in California at the same time with the creation of urban centers where feeding can be done. The researchers discovered that the population density Anna Cast It also increased over time, and it was found that this seems associated with the spread of nutrition fountains and eucalyptus -producing eucalyptus trees, both of which were presented to the region by humans.
These morphological changes occurred on hummingbirds quickly. According to the study, Anna Cast In 1930, the population was completely different from that in 1950, when bird bills already began to grow. Within just 20 years, equivalent to about 10 generations of these birds, the development left its mark, as the authors note.
To conduct the search, the team used the vision data for the types of all 58 provinces in California between 1938 and 2019, in addition to analyzing samples preserved in museums. They also turned into old newspapers ads to estimate the number of nutrients used during the past century. Finally, they developed a calculation model to predict the expansion of the hummingbird, taking into account the nutrition with the help and presence of eucalyptus trees.
