In Hawaii, this is likely leading to the decline in local populations, reducing them by 75% from 1989 to 2009. The false killer whale is more susceptible to organochloride buildup than other dolphins, being higher up on the food chain, and stranded individuals around the world show higher levels than other dolphins. It has been known to ride the wakes of large boats, which could put it at risk of hitting the boat propeller.[26][13]