In 2020 Powers and colleagues re-examined the maxillae of eudromaeosaur taxa concluding that Asian and North American eudromaeosaurs were separated by snout morphology and ecological strategies. They found the maxilla to be a reliable reference when inferring the shape of the premaxilla and overall snout. For instance, most Asian species have elongated snouts based on the maxilla (animals like "Velociraptor" are known from complete skulls), indicating a selective feeding, such as picking up small, fast prey. "Achillobator" however, is an exception for Asian eudromaeosaurs, featuring a robust and deep maxillar morphology similar to North American eudromaeosaurs which also have stocky and deep snouts, and thus indicating relationships with these members. The adaptations of "Achillobator" and North American eudromaeosaurs indicate a diet based on large-sized prey.