Eyewitnesses share amazing wildlife encounters caught on tape. A hidden camera in the Ukraine reveals a horrible trade in bears and one man goes the extra mile to save a cub. A shark fishing trip in Florida goes horribly wrong when a hammerhead makes a surprise appearance. When a ranger provokes a bull elephant, he gets caught in a life and death moment -- and loses his job. And in the swamps of New Orleans, it's cat versus alligator when the two face off over some chicken scraps.