18 Largest Rodents in the World

Patagonian Mara

The Patagonian mara resembles a small deer, weighing around 20 to 35 pounds, and can grow up to 2.5 feet in length. Native to the grasslands and scrublands of Argentina, these rodents are known for their long limbs and ability to run at high speeds. Patagonian maras are herbivores, primarily eating grasses and other plant material. Their social structure is unique, with monogamous pairs that raise their young in communal burrows shared with other maras. Although they appear rabbit-like, their size and behavior set them apart from other rodents. Maras are diurnal, spending much of the day grazing and foraging for food. Due to habitat loss and hunting, their populations have been declining in some areas.

Guinea Pig

Domesticated guinea pigs are much smaller than their wild relatives, typically weighing between 1.5 to 2.5 pounds and growing about 10 inches long. Wild guinea pigs, which are native to South America, are larger, reaching weights up to 3 pounds and lengths of nearly 12 inches. These rodents have stout bodies, short legs, and no tail, making them look quite different from other large rodents. Guinea pigs are highly social animals that live in groups in the wild, and they communicate through various vocalizations. Their diet mainly consists of grasses, vegetables, and hay. Guinea pigs are crepuscular, meaning they are most active during dawn and dusk. They have been domesticated for over 3,000 years, primarily in the Andes region.

Brazilian Porcupine

The Brazilian porcupine is an arboreal rodent that can weigh up to 10 pounds and grow to about 2 feet in length. Native to the tropical forests of South America, they spend most of their time in trees, where their prehensile tail helps them maintain balance. Unlike their North American relatives, Brazilian porcupines have shorter, less dangerous quills. They are primarily nocturnal, using their sharp claws to climb and search for food at night. Their diet consists mainly of fruit, leaves, and buds, making them an essential part of the forest ecosystem. Brazilian porcupines are solitary and prefer to live alone except during mating season. Their quills, while not as long, are still an effective defense against predators.

Muskrat

Muskrats are semi-aquatic rodents that weigh between 2 to 4 pounds and grow up to 2 feet long, including their tails. These animals are found throughout North America in marshes, ponds, and slow-moving streams, where they build dome-shaped lodges from vegetation. Muskrats are skilled swimmers, with their flattened tails acting as rudders. They primarily feed on aquatic plants like cattails and water lilies but will also eat small animals like fish and frogs when available. Muskrats are known for their ability to reproduce rapidly, which can lead to overpopulation in some areas. Their burrowing and feeding habits often alter the aquatic environments they inhabit. Despite their small size compared to other rodents, muskrats are formidable in their habitats.

European Beaver

Closely related to its North American cousin, the European beaver weighs up to 70 pounds and measures 3 to 4 feet long. These large rodents are found across Europe and parts of Asia, where they create complex dams and lodges. Beavers are known for their engineering abilities, which help regulate water flow in rivers and wetlands. They are herbivores, feeding on bark, leaves, and aquatic plants. Their large, flat tails store fat and are used for balance while swimming. Beavers were once nearly hunted to extinction for their pelts but have made a remarkable comeback through conservation efforts. Their presence in the wild is crucial for maintaining healthy ecosystems, as their dams create habitats for other species.

Pacarana

The pacarana is a rare, slow-moving rodent native to the rainforests of South America, particularly in the Andes region. Weighing between 22 to 33 pounds and growing up to 3.3 feet long, this rodent is distinguished by its stocky build and short tail. Pacaranas are nocturnal, and they feed on fruits, leaves, and plant stems. They are solitary creatures and are seldom seen in the wild due to their elusive nature. Despite their large size, pacaranas are slow movers and use their strong front legs to dig and forage for food. These rodents are not particularly fast breeders, making their populations vulnerable to habitat destruction. Due to their size and behavior, pacaranas are often compared to porcupines but lack the defensive quills.

Agouti

Agoutis, native to Central and South America, weigh between 6 to 13 pounds and grow up to 2 feet in length. These medium-sized rodents are known for their slender bodies, short tails, and strong hind legs, which allow them to sprint and leap quickly through dense forest. They primarily feed on fruits, seeds, and nuts, playing a vital role in seed dispersal within their ecosystems. Agoutis are shy, solitary animals and tend to be most active during the day. They often bury excess food, which helps regenerate forests when seeds grow into new trees. Their sharp incisors allow them to crack open hard-shelled nuts, which few other animals can manage. Agoutis are important prey for predators like jaguars and ocelots.

Lowland Paca

The lowland paca, native to Central and South America, can weigh between 13 to 26 pounds and grow up to 2 feet long. Known for their spotted fur and stout bodies, pacas are nocturnal rodents that prefer forested areas near rivers or lakes. Their large, sharp teeth are perfect for chewing through tough plant material, including fruits, roots, and seeds. Pacas are exceptional swimmers and often take to water to escape predators like jaguars and ocelots. Their diet helps spread seeds throughout the forest, aiding in plant regeneration. Pacas live solitary lives, only coming together for mating, and they dig complex burrow systems to hide from predators. Their population is under threat from hunting and habitat destruction, despite being quite elusive.

Gambian Pouched Rat

The Gambian pouched rat, found in sub-Saharan Africa, is one of the largest rats in the world, weighing up to 6 pounds and measuring around 3 feet in length, including the tail. These rodents are renowned for their intelligence and are even trained to detect landmines and tuberculosis due to their keen sense of smell. Their cheek pouches are used to store food, much like a hamster, and they feed on fruits, seeds, and insects. Gambian pouched rats are nocturnal and thrive in various habitats, from forests to human settlements. They are excellent climbers, using their long tails for balance and agility. Their size and strength make them highly adaptable, and they are considered pests in some areas but valuable allies in others.

Crested Rat

The crested rat, also known as the maned rat, weighs up to 3.3 pounds and can grow over 1.5 feet in length, including its tail. Found in East Africa, these rodents are unique for their ability to poison themselves by chewing on toxic plants and applying the poison to specialized hairs on their backs. This defense mechanism protects them from predators, as the toxins can cause paralysis or death if ingested. Crested rats have a thick, mane-like fur that gives them their name and makes them appear larger than they are. They are herbivores, feeding mainly on leaves, bark, and fruit. These nocturnal creatures are solitary and shy, rarely seen in the wild. Their unusual defensive strategy is a rare trait among rodents.

Cane Rat

Native to sub-Saharan Africa, the cane rat weighs between 13 to 22 pounds and can grow up to 2.3 feet long. These rodents are semi-aquatic and are often found near rivers, swamps, and reed beds, where they feed on grasses, crops, and sugarcane, from which they derive their name. Cane rats are an important source of bushmeat in Africa, where they are hunted for their high-protein meat. Despite being hunted, they have a high reproduction rate, which keeps their populations stable. These rodents are excellent swimmers and use water as a refuge from predators. Their large size and prolific breeding make them a resilient species, even in areas of heavy human activity. They are considered pests in agricultural areas due to the damage they cause to crops.

Eurasian Water Vole

The Eurasian water vole is one of the largest voles, weighing between 8 to 12 ounces and growing up to 8 inches long, excluding the tail. These rodents are found near rivers, streams, and wetlands across Europe and parts of Asia. Water voles are strong swimmers and spend much of their time foraging for grasses, plants, and fruits along the water’s edge. They create complex burrow systems in riverbanks, which can extend several feet underground. Water voles are a key species in their ecosystems, and their decline has a significant impact on biodiversity. Habitat loss and predation by invasive species like the American mink have reduced their populations dramatically in some areas. Conservation efforts are ongoing to protect these rodents and their wetland habitats.

Rock Cavy

Native to Brazil, the rock cavy weighs up to 2 pounds and can grow over 1.6 feet long. These rodents are well-adapted to rocky environments, where they live in crevices and caves to escape predators. Their diet consists primarily of grasses, leaves, and fruits, and they are able to survive in arid regions with minimal water. Rock cavies are social creatures, often living in small groups that share food and grooming duties. Their large, strong teeth allow them to chew through tough vegetation, which helps them thrive in harsh environments. Although not as large as other rodents, their adaptability and social behavior make them fascinating. Rock cavies are often compared to guinea pigs, though their size and habitat preferences differ significantly.

Viscacha

The viscacha, native to the mountains of South America, weighs up to 6.6 pounds and can grow up to 2 feet long. These rodents resemble small rabbits with their long ears and fluffy tails, but they are actually related to chinchillas. Viscachas are social animals that live in large colonies, often in rocky outcrops where they build burrows for shelter. Their diet consists of grasses, seeds, and shrubs, and they are well-adapted to the cold, dry environments of the Andes. Viscachas are crepuscular, meaning they are most active during dawn and dusk. Their thick fur helps them withstand the cold temperatures of their mountainous habitats. The social structure of viscachas is complex, with dominant males often controlling groups of females and juveniles.

This article originally appeared on Rarest.org.

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