mexico to the arctic and back again. but the numbers have dramatically decreased. john holland has the story off the coast of mexico's west coast. say, listen times, pause. who this the devil fish is. little sign of that now is playful. is a 15 meter 40 ton puppy a gray whale. and it's cough one of the great site for the pacific coast, from mexico to alaska. but in the last 4 years, the great wales numbers have gone down by almost 40 percent. according to the national oceanic and atmospheric research administration, the u. s. agency. and the number of carves is decreased to, to the lowest points in scientists. started counting them in the ninety's thought to sir. here martinez is in son ignacio laguna mexico together with his team where whales breed. he's been coming here for the last 15 years to monitor them as part of the laguna son ignacio ecosystem science program. i asked him why the drop i am phenomenal here. my and syndrome are that, are, you know, flucker but there's a phenomenon called skinny well in which you start seeing that their body condition is getting worse. if they're getting thinner, it's because they're not getti