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Photo credits on this page
The small pictures above come from Wikimedia Commons under free licences. Some are cropped to fit.
- Pallid sturgeon: USFWS Fish and Aquatic Conservation, Public domain, source
- Green sturgeon: Muséum d'histoire Naturelle, Public domain, source
- Leedsichthys: Dmitry Bogdanov, CC BY 3.0, source