Threatened Species, from the Very Large to the Very Small [Slide Show]
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WALRUS: Disappearing sea ice leaves these massive mammals with no place to rest after days spent at sea catching their prey, such as fish and mussels. Norbert Rosing
GREEN SEA TURTLE: Water temperature largely determines the gender of this tropical sea swimmer. Warmer waters lead to more females, thereby disrupting reproduction cycles. These turtles can live to be 80 years old. Michele Westmorland
POLAR BEAR WITH CUBS: The polar bear is the largest land predator and also the biggest bear on the planet. A superbly well-adapted animal, it has thrived where many species do not dare to tread, but its numbers are declining rapidly. Tom Mangelsen
POLAR BEAR: The melting sea ice in the warming Arctic threatens the livelihood of this bear, which was just added to the endangered species list. Cristina Mittermeier
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AMERICAN PIKA: Nicknamed the "rock rabbit," this tennis ball–size rodent can die very quickly if the temperature gets above 75 degrees where it lives in the Rocky Mountains. Wendy Shattil/Bob Rozinksi
