Sure, dolphins have those adorable smiles, but so does their far more dangerous cousin, the orca. And when marine biologists actually dub them killer whales, why should humans be surprised when they live up to the name? In February 2010, Tilikum, a bull orca at Orlando's SeaWorld, dragged a 40-year-old female trainer under the water at a "Dine With Shamu" performance, drowning her. It was the third such incident Tilikum had been involved with in 20 years, but after some new safety precautions at the park and a yearlong hiatus, he was cleared to perform again. Tilikum can now be seen working alongside his daughter Malia and his grandson Trua.