<P> Finally, niche differentiation can arise as an evolutionary effect of competition . In this case, two competing species will evolve different patterns of resource use so as to avoid competition . Here too, current competition is absent or low, and therefore detection of niche differentiation is difficult or impossible . </P> <P> Below is a list of ways that species can partition their niche . This list is not exhaustive, but illustrates several classic examples . </P> <P> When species use different resources, this can help them to coexist . For example, some lizard species appear to coexist because they consume insects of differing sizes . Alternatively, species can coexist on the same resources if each species is limited by different resources, or differently able to capture resources . For example, different types of phytoplankton can coexist when different species are differently limited by nitrogen, phosphorus, silicon, and light . In the Galapagos Islands, finches with small beaks are more able to consume small seeds, and finches with large beaks are more able to consume large seeds . If a species' density declines, then the food it most depends on will become more abundant (since there are so few individuals to consume it). As a result, the remaining individuals will experience less competition for food . </P> <P> Although "resource" generally refers to food, species can partition other non-consumable objects, such as parts of the habitat . For example, warblers are thought to coexist because they nest in different parts of trees . Species can also partition habitat in a way that gives them access to different types of resources . As stated in the introduction, anolis lizards appear to coexist because each uses different parts of the forests as perch locations . This likely gives them access to different species of insects . </P>

How can two or more species of finch co-exist without much competition in the same habitat
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