 Where alike there can be higher levels of hybridization (indicating that they are more likely to confuse each other) or levels can be as low as regions where they differ (indicating that something else allows them to separate each other).Another example is the red-fanned stout and large-headed anoles, which are sister species that overlap in range and are very similar except for their dewlap color.They are highly aggressive to individuals of their own species, but not the other.