There are plenty of natural bottlenecks in salmon streams.
The real question is how did the sea lions learn of them, and then how did other sea lions find out? And why haven’t they always been doing this like the Alaska bears?
A justice department leak?
Makes sense. Would not the natural bottlenecks tend to be far upstream? Maybe the sea lions don’t want to go THAT FAR from the ocean. It is interesting that they’ve apparently only recently figured this out in sufficient numbers to be a problem.
Maybe an increase in sea lion population is driving them to look for new food sources.
We should send the California Sea Lion back to California. Build the wall!