Some of these are excellent. Check #1 - Octopus takes the shark out. #4 is shocking.

10. Kitty Cam Reveals Killers in Our MidstIs your furry bundle of joy an invasive ecological disaster? Get a cat’s-eye view of one pet’s nightly prowl to see how effectively kitty can kill.
9. Antarctica’s Big MeltdownA study released in March reported that Antarctica has been losing ice rapidly—the equivalent of about 40 trillion gallons (151 trillion liters) of water a year. Learn what this big melt may mean for the future.
8. Anaconda Stalks World’s Largest RodentWatch as a female anaconda in Venezuela hunts down a capybara—the world’s largest rodent—and swallows her meal whole.
7. Deadly Black Mamba Snake Climbs Tree for Squirrel SnackJoin the world’s fastest serpent, the deadly black mamba—whose venom can kill a human in just 15 minutes—as it zips through the African wilderness in search of its next meal.
6. “World’s Largest Spider” Stalks South American JunglesWatch as a hapless mouse wanders too close to a foot-long (30-centimeter-long) goliath tarantula, and see the unusual adaptations that make it one of nature’s deadliest ambushers.
5. Tracking Asia’s Giant CatfishJoin conservationist Zeb Hogan as he goes in search of the world’s largest freshwater fish—Southeast Asia’s giant catfish—and explore his efforts to bring it back from the brink of extinction.
4. Elephant Slaughter Revealed in ChadWatch video and animated stills of an elephant massacre near Chad’s Zakouma National Park—evidence of a major poaching problem along the park’s borders. Warning: graphic content.
3. Puffer Fish vs. OtterTo thwart otters and other predators, Tanzania puffer fish employ some “Puff Daddy” defenses that can make the fish too much of a mouthful to be meal.
2. Swimming With Stingrays Now notorious for causing the death of TV’s “Crocodile Hunter,” the normally docile stingray uses its potentially lethal tail barb only when it feels threatened.
1. Giant Octopus Battles SharkWatch footage of an octopus’s fight with a spiny dogfish shark, and discover the culprit behind one aquarium’s unusual murder mystery.