Coelodonta antiquitatis

Coelodonta antiquitatis , commonly known as the woolly rhinoceros, was a perissodactyl of the Rhinocerotidae family that inhabited the cold steppes and tundras of the Late Pleistocene in Eurasia, from Western Europe to Eastern Siberia, becoming extinct approximately 14,000–10,000 years ago, towards the end of the last glaciation.

It was a large mammal, comparable in mass to the largest modern rhinoceroses. Adults reached between 3 and 3.8 meters in body length, a height at the shoulder of 1.6 to 2 meters, and an estimated mass of between 1,800 and 2,700 kg, depending on sex and region. It exhibited marked sexual dimorphism, primarily reflected in the size and robustness of its horns.

The most distinctive feature was its double keratinous nasal horn. The anterior horn was extremely long and laterally compressed, with lengths that could exceed one meter in adult individuals; the posterior horn, located above the frontal bone, was shorter and more robust. Analysis of cross-sections reveals a laminar pattern of keratin, similar to that of modern rhinoceroses, but with structural adaptations that suggest frequent use for removing snow and accessing the underlying vegetation.

The skull was elongated and low, with an occipital region sloping backward, reflecting a head posture oriented toward the ground, consistent with a grazing diet. The nasal bones were ossified and thickened to support the insertion of the anterior horn. The dentition was hypsodont, with molars that had high crowns and folded enamel, adapted to the consumption of abrasive grasses rich in phytoliths and mineral particles typical of dry steppe environments.

The body was covered in dense fur consisting of an outer layer of long, coarse hairs and an insulating woolly undercoat, a clear adaptation to periglacial conditions with extremely low temperatures. The skin was thick and likely contained subcutaneous fat deposits for additional thermal insulation. The limbs were relatively short and robust, reducing the exposed body surface area and contributing to heat conservation, following a pattern consistent with the Bergmann and Allen rules.

Postcranially, the skeleton showed a compact and powerful build, with a strong shoulder girdle and limbs ending in three functional toes, with the third toe bearing the most weight, typical of rhinoceroses. The ribcage was broad and deep, indicating a large lung capacity, relevant in cold, open climates.

Ecologically, Coelodonta antiquitatis was a specialized herbivore of the so-called "mammoth steppe," coexisting with megafauna such as mammoths, steppe bison, and Pleistocene horses. Its craniodental morphology and isotopic analyses confirm a predominantly grass-based diet. Its extinction is associated with a combination of rapid climate change at the end of the Pleistocene and the expansion of human populations in Eurasia, which would have increased the ecological pressure on this megafauna adapted to cold, open environments.

Approximate measurements of the Coelodonta:

• 1:35 Scale Complete
• Length 105 mm
• Height 62 mm
• Width 33 mm
• Snout-tail length 90 mm

• Complete 1:20 Scale
• Length 183 mm
• Height 108 mm
• Width 58 mm
• Snout-tail length 158 mm