here we have the finest gradation from animals with their tails only slightly flattened, and from others, as Sir J. Richardson has remarked, with the posterior part of their bodies rather wide and with the skin on their flanks rather full, to the so-called flying squirrels;
hauen artean mailaketarik mehena aurkitzen dugu, buztana pitin bat zapala dutenetatik eta, Sir J. Richardson-ek seinalatu duen bezala, beren gorputzaren atzealdea zabal samarra eta saihetsaldeetan larrua nasai samar dutenetatik hasi eta urtxintxa hegalarietaraino;