Eurasian beaver
Eurasian beavers are one of the largest living species of rodents and are the largest rodent native to Eurasia. They weigh around . In Norway, adult males average while females average , while another study found adults from the same country to average . By the average weights known, the Eurasian beaver appears to be the world's second heaviest rodent behind the capybara, but averaging slightly larger and heavier than the North American beaver. While the largest specimen confirmed on record weighed , the Smithsonian has reported that this species can exceptionally exceed . Typically, the head-and-body length is and the tail length is .
Handbook of the Mammals of the World
Initially it was intended to publish only one volume on lagomorphs and rodents. But due to the large number of described rodents Lynx Edicions organized a survey from summer to autumn 2015 in which a majority of customers decided in favor of two volumes. The sixth volume is devoted to the lagomorphs and 25 families of rodents, including the hares, pikas, chinchillas, the Laotian rock rat (a living fossil), the capybara (the largest extant rodent), and the diverse group of squirrels. The 60 colour plates are created by Toni Llobet. It covers the details to the taxonomy, range, habitat, reproduction, behaviour, and conservation status of 798 species from 27 families in two orders. It includes a special chapter on the overview of rodents, on morphology, taxonomy, and evolutionary history; why rodents are studied; and tools for studying them. Edited by Don E. Wilson, Thomas E. Lacher Jr, and Russell A. Mittermeier.