But scientists now believe the orcas actually don't have malicious intent — they're just being silly. AdvertisementDespite the damage the orcas have done, scientists believe the orcas are not trying to be aggressive or destructive. But in the sea there's not much for the orcas to interact with, so they play with the rudders." Scientists believe young juvenile orcas, who tend to be more curious and exploratory, started the trend, which then spread through the population, according to the report. Scientists believe it's likely because the tuna population, the Iberian killer whales' primary food source, has dramatically increased in recent years, giving the orcas more time away from hunting, according to the report.

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Persons: —, who've, Renaud de Stephanis, CIRCE Organizations: Service, International Whaling Commission, Business, USA Locations: Spain, Portugal, Morocco, Spanish