African clawless otter

The African clawless otter (Aonyx capensis), also known as the Cape clawless otter or groot otter, is the second-largest freshwater otter species. These animals live in permanent water bodies found in savannah and lowland forest areas across most of sub-Saharan Africa. One special feature of the African clawless otter is its partly webbed and clawless feet, which give it its name. The term 'aonyx' means clawless, coming from the prefix "a-" (meaning "without") and "onyx" (meaning "claw" or "hoof"). These otters are well adapted to their watery homes and play an important role in their ecosystems.

Taxonomy

The African clawless otter belongs to the weasel family, called Mustelidae, and is part of the group of carnivorous animals known as Carnivora. Scientists have found fossils of early otters in Europe, and the African clawless otter first appeared in the fossil record during a time called the Pleistocene. This otter is closely related to a large, extinct otter that lived on the island of Sardinia.

Subspecies

There are six recognized subspecies of the African clawless otter. These include:

• A. c. capensis
• A. c. hindei
• A. c. meneleki
• A. c. microdon
• A. c. philippsi

Recently, what was thought to be another subspecies, the Congo clawless otter, is now considered a separate species called A. congicus.

Description

The African clawless otter has thick, smooth, chestnut-coloured fur with silky underbellies and white markings on its face that stretch down to its throat and chest. Its paws are partly webbed and have five fingers, but most do not have claws, except on certain toes of the back feet.

These otters have large, flat skulls with small eye sockets and short snouts. Their teeth are big and flat, perfect for crushing food. Males are usually a bit larger than females. They grow to be between 113–163 cm (44–64 in) long, including their tails, which make up about a third of their body. They weigh between 10–36 kg (22–79 lb), with most weighing around 12 to 21 kg (26 to 46 lb). They are the third largest otter overall, after the sea otter and giant otter.

Distribution and habitat

African clawless otters live in many different places, from open coastal plains to dry areas and dense forests. They are mostly found in southern Africa, near permanent bodies of water surrounded by plants. They like logs, branches, and leaves for shelter and shade. Though slow and clumsy on land, they dig burrows in riverbanks for easy access to food and safety.

In the False Bay area of the Cape Peninsula, these otters have been seen along beaches and rocks, catching fish like mullet in shallow water. In urban areas, they are mostly active at night and rest during the day in quiet, bushy spots.

Behaviour and ecology

The African clawless otter spends its days swimming and catching food. These otters live in areas with boulders and reed beds, which give them shelter and help them catch their favorite food, crabs.

Though usually alone, African clawless otters sometimes live in small family groups. Each otter has its own area but they stay close to each other. They mark their areas with a special scent from glands on their bodies. These otters use their tails to move through the water and to keep their balance on land. They go to burrows for safety or to cool down.

Females have babies in early spring, usually two to five at a time. The babies are cared for by their mothers alone. Young otters become fully grown in about one year.

These otters mainly eat water animals like crabs, fish, frogs, and worms. They use their sensitive whiskers in the water to feel for prey. They can also use their front paws to search for food on the muddy bottoms of ponds and rivers.

African clawless otters have few predators, but they must watch out for pythons, crocodiles, and African fish eagles. When threatened, they make a loud scream to alert others and confuse attackers.

To stay cool in hot weather, they spend time in the water and use burrows. Their thick fur helps keep them warm when it's cold, since they do not have extra fat for insulation.

Threats

The biggest danger to African clawless otters comes from people. Even though they mainly eat crabs, they also eat fish, which can cause problems with people who fish. These otters sometimes go near places where people catch fish and might get caught in nets or be hunted. When people catch too many fish, there is less food for the otters.

In forested areas, cutting down trees can also be a big problem. This can make rivers muddy, which makes it hard for fish to live. Since otters need fish to eat, this can hurt their populations more than hunting them. One special place in South Africa, called the Tsitsikamma National Park, protects these otters along a hiking trail named after them, called the Otter Trail.