These chemicals (which, incidentally, give urine its aroma) are made when bacteria munch on a chemical called choline that is part of an animal's food.
People around the world munch on dirt, and not just when they're hungry enough to eat anything.
We eat while watching TV, we munch on something at our desk at work, we crunch on something while driving and drink something (sugary of course) while reading or waiting.
Sufferers don't just munch on a few potato chips, they inhale the whole bag, and they do this kind of thing habitually.
Placed on serious wounds, maggots mimic their "wild" lifestyle and munch on bacteria and dead tissue, stimulating healing and helping to prevent infection.
Some cats munch on grass or other plants, but most biologists agree that such roughage serves only as a digestive aid and provides limited if any nutritional value.
I like to get a big back of small apples and just munch on them whenever I'm hungry.
Camels munch on green shrubs outside town, and donkeys drink puddles of muddy water.
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