eli5: Why are herbivorous animals usually fatter/bigger than carnivorous animals?

Question

eli5: Why are herbivorous animals usually fatter/bigger than carnivorous animals?

In: 119

Answer 1

All energy comes from the sun. Plants turn it into something they can use and get the most energy from the sun. Herbivores eat plants, but don’t get all of the suns energy from eating them. Carnivores get even less “sun energy” cause it has been rinsed and repeated too many times.

Hence HUGE trees, reasonably large herbivores, and smaller carnivores.