O'Hare International Airport in Chicago has hired a crew of four-legged workers to help clear underbrush on 120 acres of airport property. The goats, sheep, llamas and burros recently began clearing the land, and officials say the animals are more eco-friendly and efficient than standard maintenance equipment such as lawnmowers, which aren't suitable for some of the terrain. While on the job, one of the animals stopped long enough to deliver a baby. It was named O'Hare.

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