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Star Tribune via AP, Glen Stubbe
Artist Mark Balma paints a mural of Cecil, a well-known lion killed by Minnesota dentist Walter Palmer during a guided bow hunting trip in Zimbabwe, as part of a silent protest outside Palmer's office in Bloomington, Minn., Wednesday, July 29, 2015. Palmer said that he had no idea the lion he killed was protected and that he relied on the expertise of his local guides to ensure the hunt was legal.

WASHINGTON — The U.S. Fish and Wildlife Service says it is ready to assist Zimbabwe in its investigation of an American dentist's killing of a protected African lion and will conduct its own probe.

Laury Parramore of the Fish and Wildlife Service on Wednesday declined to say what the agency might do once it has more information. But she said the agency was "deeply concerned."

Walter Palmer of suburban Minneapolis killed the lion named Cecil on a big game hunting trip earlier this month. Police have not said whether Palmer will face criminal charges in Zimbabwe. Palmer said in a statement that he was unaware the lion was protected and relied on his guides to ensure a legal hunt.

In terms of sport hunting abroad, the United States' primary authority is over importation of the carcasses, or trophies. Foreign animals can be listed under the U.S. Endangered Species Act.

Things to know about U.S. regulations and big game hunting abroad:

THE FISH AND WILDLIFE SERVICE'S ROLE

Parramore said the agency is "currently gathering facts about the issue and will assist Zimbabwe officials in whatever manner requested."

The agency could potentially find a way to block importation of the animal's body, or body parts, if Zimbabwean authorities approved it for export.

"It is up to all of us — not just the people of Africa — to ensure that healthy, wild populations of animals continue to roam the savanna for generations to come," she said in a statement.

PROPOSED ENDANGERED SPECIES LISTING

The agency proposed last year to list the African lion as threatened under the Endangered Species Act, a move that could limit the importation of African lion carcasses into the United States from some countries. But that rule has not yet been made final.

Listing a foreign species under the act allows the United States to strengthen enforcement and monitoring of imports and international trade, the agency says. A listing can also prohibit certain commercial activity with regard to body parts.

The agency said when it proposed the listing last fall that 70 percent of the current African lion population exists in only 10 major strongholds. Threats facing the lions include loss of habitat, loss of prey and hunting, officials said.

ZIMBABWE'S ANIMAL MANAGEMENT

The agency's proposal would allow permits for the importation of sport-hunted lion trophies only if the lions come from countries with a "scientifically sound management plan for African lions."

Long before Cecil's killing, Zimbabwe was heavily criticized for failing to properly manage its wildlife populations. The Fish and Wildlife Service last year announced an indefinite suspension on the import of sport-hunted trophies from elephants hunted in Zimbabwe.

The agency cited shortcomings in Zimbabwe's plans for overseeing its elephant herds and said it was "unable to find that the killing of an elephant whose trophy is intended for import would enhance the survival of the species."

Legal sport hunting, when properly regulated, is considered to be a sound element of wildlife management. Revenues from hunting can be funneled into conservation programs and finance incentives for local communities to guard protected species.