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COVER A young polar bear (Ursus maritimus) on a piece of ice
' A+ T9 X# [3 r" m8 e. Othat is drifting in the Barents Sea, northeast of Svalbard, Norway. Polar bears ! F( G+ u! N0 W# e7 L" @& y
depend on sea ice as a platform for hunting seals, but current melting and 2 v- p, s0 T$ j3 S
retreat of sea ice is increasingly forcing them onto land. A recent study has 1 W" ?1 L& s: T% s4 \5 X
found polar bears to be evolutionarily older and genetically more distinct than * o5 _2 T9 `5 \) \2 z5 v
was previously thought. See page 344. Photo:
2 D4 h& Y9 V! ]Florian Schulz, www.visionsofthewild.com
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发表于 2012-4-21 14:05
发表于 2012-4-21 16:27
