One video showed a great white shark killed by killer whales in Mossel Bay in South Africa. The video was captured by a drone and a helicopter. The shark was the victim of several attacks and at sea the event was a South African research team led by scientists from Rhodes University, the South African Institute for Aquatic Biodiversit and Drone Fanatics SA and Simons Town Boat Company.
The researchers said how these footage provides new evidence on orcas' ability to chase, capture and incapacitate white sharks. The decline in great white sharks has been noted with the presence of two killer whales called Starboard and Port, observed multiple times while hunting bronze sharks and other species.
But a direct observation of a great white shark hunt had never been made before, even though some carcasses without liver have been found. Scientists say this could be a big problem for sharks, as killer whales are highly intelligent and social animals that can pass on their knowledge (culture) to other specimens.
In the movies, killer whales attack the livers of white sharks, which they release after flipping them upside down, stunned and bit ferociously behind their pectoral fins. According to experts, the liver of a large white shark would be enough to provide the daily calories for an adult whale.
The habitat of the orca is widespread in all the seas and oceans of the world and lives both in the abyss and in the shallows near the coasts, sometimes even reaching the mouths of some rivers. Normally, however, the killer whale prefers to live in both arctic and antarctic cold waters where, in summer, it hunts among the ice floes.
Only a few populations migrate to the equator in the summer, much like the gray whales that migrate near the US coast. Sightings in the Mediterranean Sea are quite rare. Several killer whales were sighted in the Ligurian Sea near Pra 'in December 2019.
At first it was thought they came from a herd of killer whales that have lived for some time near the Strait of Gibraltar, but then it was understood that it was a group known and registered in Iceland. The researchers of the Orca Guardians Iceland association exchanged their data with Ligurian biologists and it was discovered by comparing the fins and other details, that these are specimens studied in 2017.
It is difficult to estimate the number of individuals in the world, according to the International Union for Conservation of Nature there are no precise data. One of the most reliable estimates is about 50,000 specimens.