COEUR d'ALENE — An investigation continues into the recent killings of six tundra swans near St. Maries.

Fish and Game officials said the shooting of the beautiful, white birds is rare.

“I’ve never had a swan shooting case yet in the St. Maries area or in my time as an officer, for that matter," said District Conservation Officer Dustin Horn.

He said the killing of six swans constitutes a felony. It’s also considered a flagrant violation by code, which carries increased penalties.

Tundra swans are protected under the Migratory Bird Treaty Act.

Idaho Fish and Game is asking for the public's help to find those responsible.

The six swans were among thousands migrating from California that stop in the Lower Coeur d'Alene River Basin before pushing on to breeding grounds in Alaska.

All were killed during a closed season and their bodies were left to waste, a press release said.

The swans are believed to have been killed March 25-26.

The bodies were found about a mile upriver of St. Maries on Railroad Grade Road in a private, flooded field, the release said.

Regional Conservation Officer Mark Rhodes said he knows of only a few instances where swans have been shot unlawfully.

"From a biological perspective it’s likely not having much of any impact, which is true of many or most of our violations," he said. "But from a social, ethical and legal standpoint it’s unacceptable and we’ll pursue catching those that did it.”

Anyone who might have seen or heard something related to the killing of the six swans is encouraged to contact Horn at 208-916-6871 or call the Citizen Against Poaching hotline at 1-800-632-5999. Information can also be reported online.

Horn said they have received a few tips.

"At this point, we’re still in need of more tips and detail," he said.

Information can also be reported to the Panhandle Regional Office of Idaho Fish and Game at 208-769-1414.