The Cozumel raccoon (Procyon pygmaeus) is a species of raccoon that is very close to extinction. It is found only on Cozumel Island, which is located near the Yucatan Peninsula in Mexico. This animal is also known by other names, including pygmy raccoon, dwarf raccoon, Cozumel Island raccoon, and Cozumel raccoon bear.
Classification
Clinton Hart Merriam first noticed that the Cozumel raccoon looked different from the mainland raccoon, which is called Procyon lotor hernandezii, in 1901. Later, scientists like Kristofer Helgen and Don E. Wilson supported Merriam’s findings but did not classify the other four island raccoons as separate species in their studies from 2003 and 2005. Because of this, the Cozumel raccoon was listed as the only distinct species in the Procyon genus, besides the common raccoon and the crab-eating raccoon, in the third edition of Mammal Species of the World. An archaeological study showed that the Maya people of Cozumel used raccoons that were smaller in size, which suggests that the raccoon’s smaller size is not a recent change.
No true fossils of the Cozumel raccoon have been found, though some skeletons were discovered at archaeological sites on the island. Cozumel island became separated from the mainland during the late Pleistocene, meaning the species is unlikely to be older than 122,000 years. Studies using molecular clocks estimate that the Cozumel raccoon diverged from the common raccoon between 26,000 and 69,000 years ago.
Description
Merriam described the Cozumel raccoon as much smaller than the common raccoon, both in body size and head size. It is easy to tell apart from the common raccoon because of its "broad black throat band, golden yellow tail, short and rounded nose, and unique tooth shapes." Its smaller teeth suggest it has been separated from other raccoons for a long time.
Besides being smaller and having a more rounded nose, the Cozumel raccoon looks similar to the common raccoon. The fur on its back is a grayish-brown color with some black hairs, while its belly and legs are a pale yellowish-brown. The top of its head is gray with white hairs, which contrasts with the white fur on its face and the black "mask" around its eyes. A line of brownish-gray fur runs down the middle of its nose, connecting to the "mask" on either side. Its tail is yellow with six or seven black or brown rings, which are less clear on the bottom. In males, the fur on the neck has a brighter orange color.
Adult Cozumel raccoons measure between 58 and 82 centimeters (23 to 32 inches) in total length, including a tail that is 23 to 26 centimeters (9.1 to 10.2 inches) long. They weigh between 3 and 4 kilograms (6.6 to 8.8 pounds). This is an example of insular dwarfism, a condition where animals on islands are smaller than their mainland relatives. On average, Cozumel raccoons are about 18% shorter and 45% lighter than the common raccoon subspecies found on the mainland, Procyon lotor hernandezii. These raccoons also show sexual dimorphism, meaning males are about 20% heavier than females.
Distribution and habitat
The Cozumel raccoon is found only on Cozumel Island, which is about 478 square kilometers (185 square miles) in size. The island is located off the east coast of the Yucatan Peninsula in Mexico. There are two raccoon species in Mexico: the Cozumel raccoon and the common raccoon (Procyon lotor). The Cozumel raccoon is the only raccoon species on Cozumel Island. The island is also home to other carnivores, such as the dwarf coati (Nasua narica nelsoni) and the dwarf gray fox (Urocyon sp.). Islands often do not have many land mammals, especially carnivores, so the presence of these animals makes them special.
On Cozumel Island, the raccoon lives in different habitats, but it is mostly found in mangrove forests and sandy wetlands near the northwest tip of the island. It has also been seen in semi-evergreen forests, agricultural areas near these habitats, and in the Punta Sur ecological park at the southern end of the island.
A study about the Cozumel raccoon’s home range and activity patterns showed that these raccoons have smaller home ranges than mainland raccoons. Male raccoons have larger territories than females. The species is mostly active at night, with the most activity between sunset and 4:00 AM. Their movements depend on the quality of the habitat and the presence of human activities.
Behavior
Not much is known about how many raccoons live together in a group. Raccoons are mainly active at night and usually live alone, but they may sometimes form small family groups that include the mother and her young.
Raccoons live in areas where there are about 17 to 27 raccoons per square kilometer. On average, each raccoon has a home area of about 67 hectares (170 acres). However, raccoons do not seem to protect their home areas from others. Their close relative, the common raccoon, can live in very large groups when food is plentiful.
Studies on their reproduction are limited, but females usually give birth between November and January. They may also have a second group of babies in the summer months.
Diet
The habitat preferences of Cozumel raccoons are largely influenced by the types of food they eat. These raccoons are generalist omnivores, meaning they eat a wide variety of foods, including crabs, fruit, frogs, lizards, and insects. Crabs make up 44% to 50% of their diet, with Cardisoma guanhumi and Coenobita clypeatus being the most commonly eaten species. Changes with the seasons affect their diet. During the wet season, crabs are more active and easier to find, leading to higher crab consumption. In the dry season, raccoons eat more fruit, such as sapodilla and snowberries, because these foods are more plentiful. The diet of Cozumel raccoons shows their preference for coastal and mangrove areas, where their main food sources are located.
Human-made food sources, like leftover food from people, are also often eaten by Cozumel raccoons. There is concern that increased interactions between humans and raccoons, especially in tourist areas, may cause raccoons to rely more on human-provided food in the future.
Morphological specializations
At one time, scientists believed the Cozumel raccoon was part of the Mexican raccoon group, which is a type of common raccoon. Many studies have been done to find out if the Cozumel raccoon is a different species from the common raccoon. In 2004, Cuaron and other scientists reported that research by many experts shows they are different species. The Cozumel raccoon (P. pygmaeus) has a smaller body and skull size, which is why it is called the pygmy raccoon. Other physical differences include a wide black band around the throat, a golden yellow tail, and fewer teeth. These and other features suggest they have been separated from other raccoons for a long time.
Conservation status
According to the IUCN Red List, the Cozumel raccoon is critically endangered. Recent assessments show that the population is continuing to decrease, with only about 192 adult individuals remaining worldwide. In Mexico, the species is listed as "Threatened with Extinction" by SEMARNAT and is protected by law. The Cozumel raccoon lives in a very limited area, which increases its risk of disappearing. Animals at the top of the food chain on islands often go extinct quickly after humans arrive. The main threat to the Cozumel raccoon is the development of Cozumel Island due to the tourism industry. These raccoons live mainly in coastal and mangrove areas on the island’s west side, where developers want to build beach clubs and resorts. This habitat loss has serious effects on their survival.
Tourism-related habitat destruction is the biggest threat to Cozumel raccoons. More visitors and cruise ships have caused deforestation, road construction, and broken-up habitats, especially in mangrove and coastal areas. Cozumel raccoons are increasingly found near human settlements, where they search for food in tourist areas, restaurants, and waste sites. While this may help them temporarily, eating human food can expose them to harmful substances and change their natural behaviors, leading to more conflicts with humans. The raccoons also face limited genetic diversity, which makes them more vulnerable to environmental changes and diseases.
Hurricanes have also contributed to the decline of the Cozumel raccoon population. Climate change has increased the frequency of hurricanes, making these challenges worse. Studies show that after major storms, raccoon numbers can drop by up to 60% in affected areas. Young raccoons are most likely to be killed during hurricanes, as they are often crushed by falling debris.
New threats include diseases and parasites. Cozumel has feral and domestic cats and dogs that can spread illnesses to raccoons. Each raccoon typically carries about two different parasite species. Some raccoons have developed immunity to certain diseases, but cats were recently introduced to the island by humans. Recent research also shows that mainland raccoons (Procyon lotor) are mixing with Cozumel raccoons, which may reduce the genetic uniqueness of the island species. This mixing is likely caused by humans bringing mainland raccoons to the island.
Conservationists suggest expanding protected areas, especially in mangrove and coastal forests, which are the raccoon’s main habitats. The "Área de Protección de Flora y Fauna de la Isla Cozumel" already covers some habitats, but more land protections are needed. Reducing human-wildlife interactions, enforcing waste management rules, and teaching tourists not to feed wildlife are important steps to lessen human impacts.
Another possible solution is captive breeding. If Cozumel raccoons can reproduce in captivity like common raccoons, this could help restore their numbers. However, the arrival of pets, especially feral cats, has introduced more diseases and parasites that harm raccoons. Removing feral cats is the best way to reduce these threats. For conservation efforts to succeed, experts must find ways to work with the tourism industry to protect the raccoons.
Glatston also encouraged researchers to continue studying the species to confirm that the Cozumel raccoon is a distinct species from its mainland relatives.