Two environmental groups are suing the National Park Service over cattle grazing in Capitol Reef National Park in Utah.

The Western Watersheds Project of Hailey, Idaho, and the Cottonwood Environmental Law Center of Bozeman, Mont., want the agency to study the impact grazing is having on two cactus plants listed under the Endangered Species Act.

A representative at the national park didn't immediately return a phone call Sunday.

The Salt Lake Tribune reports the lawsuit, filed Tuesday in U.S. District Court for the District of Columbia, accuses the park service of breaking environmental law by failing to consider the impacts of cattle grazing on the threatened Winkler's pincushion and endangered Wright fishhook cactus.

It says both are found within grazing allotments in the national park.