Birkenia stock image
![Birkenia stock image](https://cdn.shopify.com/s/files/1/1352/1429/products/1000px_birkenia_franz-anthony.jpg?v=1615507556)
Despite resembling a modern fish in appearance, Birkenia lived long before fishes evolved a movable jaw. It’s recognizable by the uniquely shaped scales on its back and an armorless head, unlike most other heavily guarded jawless fishes at that time.
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