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Fish and Wildlife Service are collecting tissue samples from 24 endangered mammal species, including the Preble’s meadow jumping mouse, the Mexican wolf, and the Sonoran pronghorn.

The lawsuit said the agency failed to protect the jumping mouse from environmental damage caused by the horses.

Print off the wildlife checklist before you go and watch for a Pacific jumping mouse and Roosevelt elk, among hundreds of finned, furred and feathered creatures listed.

With tails that make up most of their length, the rodents are called jumping mice because they can leap more than 2 feet into the air when frightened.

Aside from asking the court to force the Forest Service to develop stronger protections for the meadow jumping mouse, the lawsuit asks for the U.S.