On a recent January night, a drunk Londoner came across an all-out street brawl right in front of his house.

Between two red foxes.

The man, on his way home from an evening on the town, captured a video of the two animals rolling and aggressively biting at each other's throats at his doorstep, footage he recently posted online.

They are likely male foxes fighting over territory or mates, explains Erika Yery, who has been rehabilitating injured foxes at Wild Bunch Wildlife Rehabilitation in Virginia, in the eastern U.S., for more than 30 years.

The nocturnal predators normally steer clear of each other, “but this time of year is an exception,” she says—during winter mating season, "male foxes will fight