Which bird is most tolerant of the cold?

The Red-tailed Hawk is known for its ability to thrive in a variety of environments, including colder climates. This adaptability is partly due to their larger size and robust body, which helps them retain heat. In contrast, other species, such as the Harris' Hawk or Aplomado Falcon, are generally more associated with warmer regions and are less tolerant of extreme cold conditions. The Red-tailed Hawk's physiological adaptations, such as its thicker feathers and ability to find shelter in various habitats, enable it to withstand lower temperatures better than the other birds listed. Therefore, its natural history and ecological versatility contribute to its status as the most cold-tolerant among the options.