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Consider the existence of the Koala:  It awakes to spend some time eating plants that are very low in nutritional value and poisonous to most of the Earth's species.  Living on this low nutritional diet it has a slow metabolic rate and sleeps 3/4 of the day.

It has little competition and little excitement.

It has carved out an evolutionary niche.

I will find out more about Koalas and post here.