In antiquity, in a general sense, the Antiochian school tended to treat the text of Genesis as six literal days for creation, and only about six-thousand years of total world history. You can see this strongly in such writings as the Hexameron by St Basil the Great and some of St John Chrysostom's homilies. The Alexandrian school, however, had a much stronger attachment to allegorical and spiritual interpretation, and had less concern for the literal. Some of the venerable writers believed literally in the one-thousand years is a day model. Some didn't speculate as to how long creation took.
We have Saints who took the creation account literally, and we have Saints who did not take the creation account literally. To say either one is "the Orthodox position" would be a mistake. It is equally wrong to ostracize or disrespect those who differ in opinion. We can discuss the relative strengths and weakness of each position while loving each other.
If one believes in interspecies/intergenus/interfamily/interorder etc... evolution, that is fine and good. But in the past, some have tried to force the reconciliation of this opinion, with the writings of the Saints. This is a mistake, which does violence to the Saints, and to their writings.
We can have differing opinions, as long as we keep our focus on Christ and love of neighbor. We should be honest enough to admit when our opinion differs from that of the Saints. We should also be honest enough to admit when our opinion differs from the opinion of the established scientific community. And that is where I personally stand. I agree with the Scriptural interpretation of Saint Basil, St John Chrysostom, and the Antiochian school, and I disagree with the general consensus of the scientific community. This is because I believe Holy Scripture speaks plainly about Creation, (while encompassing many allegories and spiritual truths), and the scientific community, imo, is assuming conclusions based on incomplete data.