PHILADELPHIA - Environmental activists have made an unconventional addition to some of the fiberglass donkeys positioned around Philadelphia ahead of the Democratic National Convention.

Food & Water Watch says activists placed fake piles of feces below the behinds of 19 of the 57 donkeys around the city on Tuesday, symbolizing their stance that the Democratic Party's platform on fracking is "crappy."

Organizer Sam Bernhardt says citizens oppose the controversial drilling technique that uses high-pressure water and chemicals to extract oil and gas from deep underground rock. He says the Democratic Party could have called for a ban on the practice but failed.

The group also plans to march on the eve of the convention this month.

Artists painted the donkeys to represent the 50 states, five territories, Washington, D.C., and overseas Democrats.