The average life span of a masked shrew is less than 14 months. Blossum, P.M. 1932. A pair of long-tailed shrews (Sorex cinereus cinereus) in captivity. Journal of Mammalogy, 13:136-143. Buckner, C.H.

Among Adirondack mammals, pygmy shrews hold several records. Some adults weigh only 2-3 g (0.11 oz) and thus are the smallest mammals in the world. This species is also one of the rarest, with only ...