Our rarest native mammal — the pine marten — is making a comeback

… in the Boreal forests of Canada and the northern United States … in range and density of native pine marten populations has, … in the world of our native mammals.
Grey squirrels are … with, and spreading infection to, native red squirrels. The recovery of …… in the Boreal forests of Canada and the northern United States … in range and density of native pine marten populations has, … in the world of our native mammals.
Grey squirrels are … with, and spreading infection to, native red squirrels. The recovery of …