Groundbird

Groundbird is a future descendant of hoatzins that survived and evolved into completely flightless burrowing birds. They are omnivores that mainly feed on roots, tubers, small animals, and carrion. They have filled the niche of the now-extinct American badgers. They are about the size of a Eurasian badgers.

Evolution
After the Late Holocene ended, humans are now gone, but it was already too late for some species of small carnivores of North America, including badgers, which had became extinct. To fill their niche, a species of bird, a hoatzin, had spread from South America into North America, where their population exploded due to abundance of food in the future North America. Eventually, these birds became more and more omnivorous and less herbivorous, making them spend more time on the ground. They started to retain three clawed fingers through adulthood. They started go walk quadrupedally and dig burrows in a similar fashion to the extinct American badgers. Hoatzins has evolved into groundbirds.