Some of the largest living animals on the planet eat the tiniest food. For humpback whales, it's krill – small shrimp-like animals floating in the ocean. Capturing enough krill can take a lot of work, ...

While the “smart” animal club has been steadily adding new members, the world’s whales can be considered among the founders. The roughly 50 million-year-old animal lineage shows evidence of their own ...