> How then did the Plioocene megafauna grow so large if the plants they consumed were 'faster, bigger [...] with less nutrient density'? Herbivores are adapted

> How then did the Plioocene megafauna grow so large if the plants they consumed were 'faster, bigger [...] with less nutrient density'? Herbivores are adapted to extracting nutrients from a food source that isn't nutrient or calorie dense. Compared to carnivores, they eat a massive amount of food relative to their body weight. If a food source is less nutritious, they just eat more of it.