At Munich Zoo you can watch the courtship rituals of the banded mongoose, hear the morning song of the scarlet ibis or visit the Indian elephants, who help help keep the lights on with electricity generated from their dung.
They can do this because Munich Zoo has harnessed "poo power," energy stored in animal waste, which can be converted into a fuel known as "biogas."
It works like this: The zoo has built three large containers, each capable of holding about 100 cubic meters of animal waste -- that's around a week's worth of dung collected from all the vegetarian animals in the zoo.
Once inside the containers, it's mixed with warm water and the bacteria in the dung is left to decompose in an oxygen-free environment for 30 days.
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