This National Geographic achtergrond contains
sitka sparren, sitkaspar, picea sitchensis, spoortunnel, and spoorweg tunnel.
There might also be
beuken, beuken boom, beuk, amerikaanse witte berk, papier berken, paperbark berk, kano berk, betula cordifolia, papierberk, paper birch, kano birch, betula papyrifera, douglas spar, and douglas fir.
Billions of birds migrate annually across the Western Hemisphere… but if we don’t know where they go when they leave their breeding grounds, how can we protect them?