![]() ![]() The Raven cockatoos are a separate group as well, with five species that are more related to each other than to all the other cockatoo species. In the graph you can also see that there are two groups of Cacatua species: the bigger species (with Cacatua alba) and the smaller corellas (with Cacatua sanguinea). In this particular phylogenetic tree, the Palm cockatoo ( Probosciger) is the least related to all other species of cockatoos. Species that are less related to each other, will have a common ancestor that is farther up in the tree (to the left) than species that are more closely related. You can determine the relatedness of two species by comparing the length of the bars, less distance between species means more relatedness. In the next graph you can see how all the cockatoo species are related to each other. Galah cockatoo ( Eolophus roseicapilla). ![]() Gang-Gang cockatoo ( Callocephalon fimbriatum). ![]()
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