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Her example illustrates "intraspecific variation," which the study found to be pervasive across all North America's mammals.

“The reason that they have a tail club is probably not driven by predation, but more for intraspecific combat,” Dr. Arbour said.

It’s the fifth panther death reported this year, the second from intraspecific aggression, according to the Florida Fish and Wildlife Conservation Commission.

Experts say the suspected cause of death was intraspecific aggression.

It’s the fourth fatality this year attributed to intraspecific aggression, out of 30 total panther deaths.