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"Potamornis (River Bird) is a more advanced member of the Hesperornithes, and more similar in form to Hesperornis. It is an adept swimmer, but is completely flightless."

Saurian: A Field Guide to Hell Creek

Potamornis was a hesperornithean avialan known to have lived in the Hell Creek Formation and in the Lance Formation. It was small, weighing around 1,5 to 2 kg, meaning it had the perfect weight to be a flying animal. However, analysis show Potamornis share more similarities with hesperornithids, a group of hesperornitheans known to have been flightless and dedicated to a purely aquatic life. If that's true, then Potamornis could have been a small flightless avialan that crawled awkwardly on land, or at least had few flying abbilities, but had a good set of swimming gracile techniques. Potamornis had a shape simillar to a loon, grebe or cormorant, meaning it was a diver, using its back legs for underwater propulsion. In this way, it was able to catch its favourite food: small fish and aquatic invertebrates.

In Saurian Edit

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Potamornis swimming

There are no known plans for the inclusion of the Potamornis in the final game, but it is currently in the official game's artbook.

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