The orca, or killer whale, is the biggest of all dolphin species. The males grow to the size of a fully-grown elephant – some 6-8 metres long, and weighing around 6 tonnes. Female orcas are slightly smaller, with a fighting weight of some 5 tonnes and a length of 6-7 metres.
The killer whale is also one of the most effective killers in the ocean. It has about 50 formidable pointed teeth (almost as many as a crocodile), and these can