Killer whales are ramming into boats and damaging them. The reason remains a mystery.

Reports of killer whales appearing to try and capsize boats off the coast of Spain and Portugal have raised questions about the giant sea creatures and the motive behind their erratic actions. The behavior is unusual, and began in 2020, says Andrew W. Trites, professor and director of Marine Mammal Research at the University of British Columbia. 

In the past two years, these incidents have more than tripled according to data released by GTOA, a group that researches orcas in the region.

"Nobody knows why this is happening," Trites told CBS News. "My idea, or what anyone would give you, is informed speculation. It is a total mystery, unprecedented."