Monkeys go fishing to survive harsh Japanese winters

Snow monkeys living in one of the world's coldest regions survive by 'going fishing' – scooping live animals, including brown trout, out of Japanese rivers and eating them to stay alive, a new study reveals.

Population density

Population density (in agriculture standing stock and standing crop) is a measurement of population per unit area or unit volume. It is frequently applied to living organisms, and particularly to humans. It is a key term used in geography.

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