Eurasian beaver

Castor fiber, the Eurasian beaver (Castoridae), is the largest rodent of Eurasia: head-body length 80–100 cm, tail 25–50 cm, weight 11–30 kg and up to a recorded 31.7 kg, females slightly larger. The broad, scaly tail serves as a rudder and fat store, and the ever-growing incisors are worn down by felling trees. Reduced to about 1,200 animals in eight populations by the early twentieth century, it has been reintroduced across Europe and numbered about 1.5 million by 2020. It feeds on bark and twigs and builds dams and lodges. IUCN rated it Least Concern in 2021.