https://en.wikipedia.org/wiki/Iberian_orca_attacks

Monohulled sailing vessels are the most frequent targets of the orcas, with yachts, catamarans, and vessels with spade rudders being the types most often attacked and damaged.

CIRCE Conservación Information and Research coordinator Renaud de Stephanis suggested that the orcas break the rudder out of frustration, preferring the sensation of the propeller when a sailboat is running its engine.[27]

Not very climate-friendly, these orcas.