The state of Kansas has joined Oklahoma in a lawsuit challenging the process used by the federal government to list the lesser prairie chicken as a threatened species.
Kansas Attorney General Derek Schmidt's office announced Wednesday that Kansas has become part of a case filed in federal court in Oklahoma.
Oklahoma Attorney General Scott Pruitt filed the lawsuit in February before the U.S. Fish and Wildlife Service formally listed the lesser prairie chicken as threatened.
Kansas officials contend that the listing isn't necessary because the five states with lesser prairie chicken habitats have developed a conservation plan. They are Kansas, Oklahoma, Colorado, New Mexico and Texas.
The U.S. Fish and Wildlife Service says the lesser prairie chicken's population has decline dramatically since 2012.
The Associated Press contributed to this report.