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 $ a! [7 h* n% R; F( @7 t2 U" r5 j
COVER A young polar bear (Ursus maritimus) on a piece of ice & Q* M( R N/ L: Z# `' S' S
that is drifting in the Barents Sea, northeast of Svalbard, Norway. Polar bears
- i' B8 J& K. b o; Z8 {depend on sea ice as a platform for hunting seals, but current melting and 3 t: M" }7 U! |+ \0 A! z/ o. ] ~8 G
retreat of sea ice is increasingly forcing them onto land. A recent study has
9 h; `2 z) p3 `. g% Z, Cfound polar bears to be evolutionarily older and genetically more distinct than
. V% ? x, z, u Iwas previously thought. See page 344. Photo:
8 x7 a; \; K4 O) z( T. O" lFlorian Schulz, www.visionsofthewild.com
$ x* x8 Q$ |( Z[hide][/hide] |
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发表于 2012-4-21 14:05
发表于 2012-4-21 16:27
