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Cities turn to nature to help solve unique urban problems

Many cities are looking to add more wildlife to help revitalize water, clean the air and maintain urban land. For example, cities on the East Coast plan to introduce oysters to rivers, and San Francisco plans to add clams to a polluted urban lake, because the shellfish can help eradicate bacteria. Goats, sheep and llamas are being used to maintain overgrown areas, and plants are being added to cultivate ecological habitats.

Read more about: How Humans Can Engineer Wilder Cities With the Help of Animals