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The name mammatus comes from the Latin mamma which means 'udder' or 'breast'.

During their trips they met a relative claiming to be the world's oldest man, picked up work in tiny sea ports and drank camel's milk straight from the udder.

A livestock veterinarian at the University of Wisconsin, Poulsen had seen sick cows before, with their noses dripping and udders slack.

The FDA has said that raw milk is full of viral and bacterial particles from infected udder tissues, cow manure, milking equipment and other sources — and it's not the kind that benefits gut health.

Even so, experts say bacteria can still contaminate milk — even when procured from a sparkling-clean udder.