Which types of predators swiftly took over the top spots on the food chain after the largest phorusrhacids disappeared?

Answer

Mammalian carnivores like Smilodon and Arctotherium

Following the influx of placental carnivores, creatures such as Smilodon (saber-toothed cat) and Arctotherium (giant short-faced bear) swiftly took over the highest spots on the food chain.

Which types of predators swiftly took over the top spots on the food chain after the largest phorusrhacids disappeared?

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