Several related bird species live in a desert.One species is much smaller than the other species.This small species nests in holes in cacti.Because the bird is so small,it can easily squeeze between the spines of the cactus and create a well-protected nest.This is an example of

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The fact that the small bird species is able to create a well-protected nest in the cactus holes demonstrates that this adaptation provides a survival advantage. Over time, individuals with this trait will be more successful at reproducing and passing on this trait to their offspring. This process of differential reproductive success due to advantageous traits is known as natural selection.

Several Related Bird Species Live in a Desert