That's how all that kelp gets onto shore. Big storms, big waves, tearin' up the kelp forests & dropping them on the beach.
So you'll still get occasional 20, 30' waves even after a local storm is over.
When it's otherwise calm & the cows are out grazing on the beach.
So the thing about cows is they're kinda just a fermentation tank on legs.
Their body is a big hollow barrel with a lot of gas in it (mostly lungs, some CO2 & methane in the gut).
They float GREAT.
So yes, sometimes they get whacked by big waves when they're grazing on the beach. But don't worry, they don't drown! They float! They can swim!*
*Well enough to cross a river. Not well enough to get back to land in the North Pacific.
Cows are not a maritime creature.
So.... someone has figured out that there's a magic island that occasionally drops cows into the ocean.
