Wisconsin Cougar Death | Necropsy Results & Findings

Investigation Into a Rare Cougar Death

A two-year-old male cougar found dead on railroad tracks in Adams County, Wisconsin, remains a mystery to state biologists. The animal, which originated in Nebraska, was struck by a train on Feb. 9, 2026, near the town of Friendship. Wildlife officials recovered the carcass and performed a detailed necropsy to determine if the predator was alive at the moment of impact or had already died from other causes. The final report, released in August 2026, leaves the specific cause of death as undetermined.

Randy Johnson, a large carnivore specialist with the Department of Natural Resources, oversaw the investigation. The team aimed to identify signs of gunshot wounds, poisoning, or other traumatic injuries that might have occurred before the train collision. Biologists tracked the young male’s movement from the Great Plains for months before it arrived in central Wisconsin. Its GPS collar ceased transmitting data, but numerous trail camera images documented its eastward path across the state. This movement pattern reflects the typical behavior of young male cougars dispersing from core populations in the Dakotas and Nebraska.

Necropsy Findings and Physical Anomalies

Wildlife veterinarian Lindsey Long conducted the necropsy on March 4, 2026. The examination of the 122.7-pound animal revealed that it appeared to be in a prone or lying position when the train struck it. This specific posture led researchers to conclude that the animal was likely dead before it was bisected by the train wheels. Yet, the physical evidence provides few clues as to why. The report noted that there were no injuries to the chest wall or abdomen that would indicate a prior gunshot or significant blunt force trauma.

Missing from the remains were the heart and lungs, a detail that hindered a final determination. The liver remained intact and was sent for toxicological analysis to check for common poisons or chemical residues. The results showed no detectable toxins. Consequently, the DNR listed the official cause of death as undetermined, leaving the final hours of the cougar’s life an open question.

Status of Cougars in the Midwest

Cougars once lived in Wisconsin but were wiped out by 1908. While state agencies have documented them regularly over the last 20 years, Wisconsin currently holds no evidence of a breeding population. All observed animals are believed to be transient males wandering in from western states. This differs from trends in neighboring regions where reproduction has been confirmed in the Upper Peninsula of Michigan and northern Minnesota.

Conservationists keep a close watch on these sightings, as they offer insight into how predators migrate across the landscape. The cougar killed in Adams County did not display aggressive behavior toward people or livestock during its time in the state. The DNR continues to rely on public reports through its online wildlife observation form to track the presence of these animals. Residents are encouraged to submit photos and location data to help the agency gather more information on these infrequent visitors.