No two species of anoles lizards living in the same geographical location have dewlaps of the same size, shape or color. why?

The reasons for the differences in dewlaps are these:
1.Male anole lizards use dewlaps to court females.
2. Female anole lizards distinguish males of their own species from males of other species by their dewlaps.
3. Differences in dewlaps keep different anole species re productively isolated, even when they live together.

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