Sheep as Groundskeepers

My local public school district is using sheep as summer groundstenders:

"Sheep are taking over some of Carlisle Area School District groundskeeping chores.

"They are saving the district up to $15,000 a year and cutting local air pollution...

"Instead of workers spending six hours a week mowing and trimming near solar panels, sheep have moved in for the summer. They nibble grass and weeds each morning and laze under panels during hot afternoons."