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“Living gigantic sharks, such as the whale shark and basking shark, as well as many other gigantic aquatic vertebrates like whales have slender bodies because large stocky bodies are hydrodynamically inefficient for swimming,” Shimada said.

Filter feeders are everywhere in the animal world, from tiny crustaceans and certain types of coral and krill, to various molluscs, barnacles, and even massive basking sharks and baleen whales.

The marine environment around the Treshnish Isles is also part of the Sea of the Hebrides Marine Protected Area due to the presence of basking sharks and minke whales.

Most of the time his only company are seals, basking sharks and seabirds such as puffins and razorbills.

He once led a boat in hot pursuit of what he thought was a school bus–size basking shark—only to find the wake he was following came from a lone salmon.