September 27, 2010 -- Thousands of walruses gathered together in a dangerous "haul out" on the coast of Alaska earlier this month. Scientists say the walruses came ashore in such large numbers because their normal habitats, Arctic ice floes, are melting.

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September 8, 2010 -- Blue crab larvae, collected in the Gulf of Mexico near the BP oil spill, have been found to have oil droplets inside their shells. But scientists say the oil may leave the crabs when they grow and molt.

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Great Danes stretch more than a meter from paw to shoulder and can easily weigh more than 90 kilograms. A Chihuahua fits snugly inside a purse. Domestic dog breeds are more varied in body size and shape -- not to mention coat color and fur length -- than any other land-based mammal. Yet, according to a new study, a mere two to six regions in doggy DNA account for most of this diversity.

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This video discusses how animal conservation groups are working to establish pathways for big cats to travel through human-populated areas. One such corridor is in place for Costa Rica's jaguars.

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This video discusses how global warming and coastal development are decimating Pacific sea turtle populations. In Costa Rica, a group of one-time poachers is giving baby sea turtles a chance at survival.

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