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Message: <blockquote data-quote="Fenris" data-source="post: 1868027" data-attributes="member: 2820">Not at all. You are assuming that Gryphons are decended from both birds and lions. Why can't they be their own independant species? That through convergent evolution have come to have body parts that resemble lions or birds. Analogous structures not homologous.And in biology, you do have branches that remerge together. The key, as Umbran mentioned is whether the offspring are fertile or not. Technically since Elves, Orcs and Humans can all produce fertile offspring they have to be classified as the same species! They would merely be different races Biology not Fantasy) or sub-species of each other.With magic and planar issues, it may be best to envision the tree not in two diminsions, but in three: time, genetic relatedness and magical relatedness. Where in that third diminsion you can have branches merging and compensate for otherworldly intervention.</blockquote>