Which subspecies of the peregrine falcon is considered the largest?

The largest subspecies of the peregrine falcon is Peale's peregrine. This subspecies is known for its substantial size compared to others within the peregrine species. Peale's peregrine can be found primarily along the coastal regions of the Pacific Northwest in North America, where it inhabits marine environments and relies on a diet that includes seabirds.

The size difference in Peale's compared to the other subspecies is due to its evolution in a habitat where larger body size may confer advantages in hunting and survival. The increased body mass helps in both hunting and regulating body temperature in the cooler coastal climates they frequent. Other subspecies, while robust, do not reach the dimensions of Peale's, making this distinct subspecies a fascinating subject of study within falconry and ornithology.