A fifth island raccoon population, the Cozumel raccoon, which weighs only 3 to 4 kg (6.6 to 8.8 lb) and has notably small teeth, is still regarded as a separate species.
The four smallest raccoon subspecies, with a typical weight of 1.8 to 2.7 kg (4.0 to 6.0 lb), live along the southern coast of Florida and on the adjacent islands; an example is the Ten Thousand Islands raccoon (Procyon lotor marinus).
Unlike other procyonids, such as the crab-eating raccoon (Procyon cancrivorus), the ancestors of the common raccoon left tropical and subtropical areas and migrated farther north about 2.5 million years ago, in a migration that has been confirmed by the discovery of fossils in the Great Plains dating back to the middle of the Pliocene.
Four of these subspecies living only on small Central American and Caribbean islands were often regarded as distinct species after their discovery.
The kits are subsequently raised by their mother until dispersal in late fall.