one shot
plentyspectrum
Inside the Dairy Industry 19
Eco Oscars 20
Punky Brewster Goes Green 22
Superhero of the Seas 24
Science and Beer 26
Tracking Turtles Online 28
Junk in the Family Trunk 30
photographs by tony clevenger
BEAR
Necessities
This grizzly bear in Canada’s Banff National Park isn’t
ambling along just any path—it’s walking over the TransCanada Highway on a wildlife crossing, a semi-natural
bridge that provides animals secure passage across
the busy, four-lane highway. The park now has 24 such
bridges and tunnels. And grizzlies aren’t the only beasts
that walk on the safe side: Since 1996, ten large-mammal
species (including elk, cougar, and wolf) have used the
crossings more than 95,000 times. The structures
prevent animals from becoming roadkill and also connect
habitat divided by roadways, which can help boost genetic
diversity. Wildlife crossings are increasingly popular in
North America: Their numbers doubled in the last decade,
—Alisa Opar
and more than 600 now dot the continent.
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