Science Says: Diet plays big role in how huge whales can get

A new study finds diet plays a big role in how large whales can get. Researchers chased 300 whales of various species in small boats and attached sensors with suction cups, allowing them to record what the animals were doing when they made their dives for food. The study published by the journal Science included 90 blue whales, the biggest animal ever to live. The findings suggest body size is controlled by how whales capture prey and how much food is available. An independent scientist says a whale's ability to process food could be another factor.