ELi5: How do some animals get enough nutrients out of eating hay or grass or a single variety of leaf for their entire lives?

Question

ELi5: How do some animals get enough nutrients out of eating hay or grass or a single variety of leaf for their entire lives?

In: 293

Answer 1

They don’t.

The grass meadow/field/paddock has multiple varieties of grass, each with a different ratio of nutrients.
Grass eaters also ferment their food along their gastrointestinal tract