Címke: populációcsökkenés

Mintegy hárommilliárd észak-amerikai madár tűnt el 1970 óta

Az észak-amerikai kontinensről mintegy hárommilliárd madár tűnt el 1970 óta, a teljes állomány mintegy 30 százaléka, az olyan mindennapos madaraknak, mint a veréb és a feketerigó is csökken a populációja - írták amerikai és kanadai kutatók a Science című tudományos folyóirat honlapján közzétett tanulmányukban. "Megdöbbentő" - közölte Ken Rosenberg, a...

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