'Two types of killer whale' swim in UK waters

One type eats small fish and lives in closely-related pods, the other eats marine mammals such as dolphins and is related to the Antarctic killer whale.

If the two continue on the same trajectory, they could evolve into two different species and conservation efforts will need to be focused on each separately, the researchers claim. Dr Andy Foote, from the University of Aberdeen, undertook the study along with colleagues from universities and museums in Denmark and the UK.

It's exciting to think about two very different types of killer whale in the waters around Britain, said Dr Foote.

Killer whales aren't really a species that we think of as being a regular visitor to Britain, but in fact we have two forms of these killer whales in our waters.

Otherwise known as Orcas, killer whales are the largest member of the dolphin family and live in family groups called pods. They are known for their intelligence and range of hunting behaviours.

Dr Foote and his team made their discovery by examining the teeth from remains of killer whales stranded over the past 200 years. They found that the teeth fell into two distinct camps: those that were well-worn and those featuring virtually no wear at all.

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