Because killer whales and orcas are top predators, they take in all the PCB contamination consumed by their prey, from fish to seals to sharks. The female orcas' ovaries are stunted by PCBs, which reduces the number of calves they may have.
Orcas migrate to colder regions in the north every November by swimming from the eastern Atlantic, where they spend their summer months breeding. They primarily consume throughout the colder months to gain energy before traveling back to the tropics in January and February.
Previously, the orcas, sometimes known as killer whales, could be seen in Tysfjord in Norway since it is "north enough" for them. The killer whales' wintering grounds were the fjords, and the dolphin species of Tysfjord would swim into them to catch herring.
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