As we left the inlet and hugged the shoreline of Monomoy en route to the mothership, the reason became readily apparent. From a distance the large brown masses on the beach looked like large piles of riprap, or rocks, but then we noticed the rocks moving. The beach was covered with seals. The National Marine Fisheries Service estimates the local seal population to be somewhere around 16,000. Great white sharks, like the one hooked by Ocearch only two days prior, like to eat them.