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In page Poebrotherium:

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Unlike its modern cousins, which are either adapted for desert or alpine conditions, Poebrotherium took the place of a gazelle or deer in the White River Fauna ecosystem. This trait was taken to an extreme in later camels, notably Stenomylus. Fossil evidence has shown that Poebrotherium was a popular prey item for the entelodont Archaeotherium. Remains of partial Poebrotherium carcasses have been found fossilized, and appear to have been killed and cached by Archaeotherium, the only animal known from the White River ecosystem that could have made the feeding marks found on the bones of Poebrotherium.[3][4]