(Courtesy Eco-Goats)

A herd of more than 100 of the four-legged creatures will be grazing this week at Congressional Cemetery — where luminaries including J. Edgar Hoover and John Philip Sousa repose — as part of a demonstration project to show off the animals’ ecologically friendly landscaping skills.

Spectators are invited to watch as they chew through invasive species, “eliminating vines, poison ivy, ground cover and even fallen debris all the while fertilizing the ground,” promise the organizers of the event, the nonprofit Association for the Preservation of Historic Congressional Cemetery and Annapolis-based Eco-Goats.

That might just mean that the goats will be more productive than Congress was this year.