"The term redtail may refer to the following animals: Red-tailed hawk ( Buteo jamaicensis), a North American bird of prey. Red-tailed boa (Boa constrictor), a Central American snake. Redtail catfish (Phractocephalus hemioliopterus), a South American freshwater fish."
So, the former Redskins, who were Native American warriors, will now either be haws, snakes or catfish. Take your pick.