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My understanding, that may be wrong, is that cellulose/fibre has little nutritional value to many animals because it's hard to break down thus making consumption inefficient. However, Ruminating mammals, other mammals such as black bears, and many insects such as grasshoppers digest grasses.

Are there any birds with the gut flora to break down fibre? Or even some that eat grass but digest it in another way?

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up vote 8 down vote accepted

The hoatzin has a digestive system that makes use of bacterial fermentation. Many other birds also consume grass, e.g. ostriches, ducks and geese.

There's also a large body of literature on how birds can digest cellulose.

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+1 It could also be noted that the fact that Canada Geese eat grass is one of the reasons that they are thriving (i.e., a nuisance) in the human constructed suburban environment of lawns and ponds. –  KennyPeanuts Feb 18 '13 at 14:39

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