Since then, other scientists have generally agreed with Merriam's assessment, especially Kristofer Helgen and Don E. Wilson, who have dismissed this classification for the other four island raccoons in their studies in 2003 and 2005.

Data from molecular clock studies implies a divergence date from the common raccoon of anywhere between 26,000 and 69,000 years ago.

The fur over the upper body is buff-grey ticked with occasional black hairs, while the underparts and legs are pale buff in color.

The top of the head lacks the buff tinge of the rest of the body, and has a grizzled grey coloration, contrasting with the white fur of the muzzle and chin, and with the black "mask" pattern around the eyes.

This represents an example of insular dwarfism, and the animals are, on average, about 18% shorter and 45% lighter than the subspecies of common raccoon found on the local mainland, P. lotor shufeldti.

[4][13] However, it has also been captured in semi-evergreen forests and agricultural lands surrounding these preferred habitats.,[8][12] and in the Punta Sur ecological park at the south end of the island.

They are primarily nocturnal and solitary animals, but may sometimes form family groups possibly consisting of the mother and cubs.

[15] However, individuals do not appear to defend territories to any great extent, and their close relative, the common raccoon, can exist at very high densities when food is abundant.

[16] Although there have been no detailed studies of their reproductive habits, females seem to give birth primarily between November and January, possibly with a second litter during the summer months.

Other morphological differences include a broad black throat band, golden yellow tail and reduced teeth; "these and other characteristics point to a long period of isolation".

[18] One conservation approach would be to reduce or even eliminate human impact on the mangrove forests, especially in the northwest corner of the island.

Additionally, the arrival of pets, especially feral cats, brought more diseases and parasites that are having a significant effect on the raccoons.