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.