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# W. E3 L, h2 G5 C) k5 {COVER A young polar bear (Ursus maritimus) on a piece of ice
( I- j& y. z( u# t: mthat is drifting in the Barents Sea, northeast of Svalbard, Norway. Polar bears
, R: z& ~( L% L9 _depend on sea ice as a platform for hunting seals, but current melting and * @) w6 O2 X* {4 Q' `
retreat of sea ice is increasingly forcing them onto land. A recent study has ) p7 U' q" i$ `" B
found polar bears to be evolutionarily older and genetically more distinct than
, f( p4 b$ Z8 X; ]& `; ?" `was previously thought. See page 344. Photo:
7 M/ ?" q0 O. I+ FFlorian Schulz, www.visionsofthewild.com 6 R8 e# M0 `; l" F1 M$ x* c
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发表于 2012-4-21 14:05
发表于 2012-4-21 16:27
