The lawn mower with a difference at Chicago O'Hare airport

No doubt it's an unusual idea that seems to save money, noise and is very echological too.

Cute!

Chicago's bustling O'Hare airport has hired new crew to keep the grass cut: a herd of 25 goats, sheep, donkeys and llamas. Yes, llamas.

The rocky and hilly areas around the runways were tough to mow and was damaging the city's expensive equipment.

But apart from trimming the grass they have another important function - keeping wildlife, like birds, from interfering with flights.

Long grass isn't just messy, airport officials explained as they unveiled the new crew, It's also a breeding ground for the small rodents that attract hawks and other birds of prey.

It sounds like a match made in heaven.

From CBBC Newsround