QUESTION:
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" IMMIGRANTS ?" THE DEFENSE DEPARTMENT IS INVESTIGATING REPORTS THAT NUDE PHOTOGRAPHS OF FEMALE MARINES, SOME TAKEN WITHOUT THEIR KNOWLEDGE, WERE SHARED ON A SECRET FACEBOOK PAGE. THE PAGE CALLED " MARINES UNITED" HAD NEARLY 30, 000 FOLLOWERS BEFORE IT WAS TAKEN DOWN. COMING UP NEXT, A BREATHALYZER TEST FOR KILLER WHALES .>> Pelley: WE END TONIGHT WITH A HOUSE CALL ON ONE OF THE OCEAN'S MOST MAJESTIC CREATURES. MARK PHILLIPS SAILED TO THE BOTTOM OF THE WORLD FOR OUR " CLIMATE DIARIES .">> Reporter: A POD OF KILLER WHALES IS SPOTTED CROSSING A STRETCH OF OPEN WATER. RESEARCHERS JUMP INTO SMALL BOATS TO CHASE THEM, JUST LIKE IN THE OLD DAYS. THIS HUNT, THOUGH, ISN'T ABOUT KILLING WHALES. IT'S ABOUT TRYING TO SAVE THEM .>> ONE OF THE REASONS WE STUDY TOP PREDATORS IS TO UNDERSTAND THE HEALTH OF THE ECOSYSTEM THAT HELPS SUPPORT THEM .>> Reporter: AN ECOSYSTEM THAT IS CHANGING. JOHN DURBAN AND HOLLY FEARNBACH, MODERN WHALE HUNTERS, USING MODERN GEAR, A CAMERA MOUNTED ON A DRONE TO GIVE THE WHALES A HEALTH CHECK- UP. AND FINDING SOME ARE IN TROUBLE .>> SHE'S VERY, VERY THIN. YOU CAN SEE HER RIBS REALLY CLEARLY. SHE'S LOST ALL OF THE FAT ALONG HER ENTIRE BODY .>> YOU'RE LOOKING AT A DYING WHALE .>> AND SHE HAS A DEPENDENT OFFSPRING. ONCE THE FEMALE DIES, SHE WILL LOSE HER CALF .>> Reporter: IT'S TOO EARLY TO KNOW WHY IT'S HAPPENING, BUT THE PRIME SUSPECT, ANTARCTICA IS WARMING UP .>> THERE IS A PROBLEM WITH FEWER SEALS .>> LESS ICE, FEWER SEALS, IS THAT A LEAP ?>> Reporter: HOLLY AND JOHN HAVE HAD TO COBBLE THIS PROCESS TOGETHER. SHE WORKS FOR A MARINE ANIMAL WELFARE ORGANIZATION CALLED SR3. HE WORKS FOR NOAA FISHERIES. THEY GET TRANSPORTATION IN ANTARCTICA THE WITH LINDBLAD .>> THIS IS THE SEVENTH YEAR IN A ROW WE'VE CONDUCTED RESEARCH .>> Reporter: AND IT'S THE LONG- TERM COMMITMENT THAT'S IMPORTANT .>> WE'RE STUDYING ANIMALS THAT LIVE AS LONG AS WE DO. TO UNDERSTAND THEM AND GET ENOUGH OPPORTUNITIES WITH THEM, IT TAKES MULTIPLE YEARS .>> Reporter: RIGHT NOW, THOUGH, EVEN THE SHORT- TERM COMMITMENT IS IN DOUBT. MARK PHILLIPS, CBS NEWS, ANTARCTICA .>> Pelley: AND THAT'S THE " CBS EVENING NEWS" FOR TONIGHT. FOR ALL OF US AT CBS NEWS ALL AROUND THE WORLD, GOOD NIGHT.
