Woods Hole Oceanographic Institution

 Belly Up! The whales flipped over often as they swam together. They swam belly up side by side and stroked one another with their pectoral flippers. This picture shows one of the humpbacks belly up with it's right pectoral flipper visible out of the water (the left on is submerged). You can see the bumps (called tubercles) on the trailing edge of the fin. It is thought that they make the flipper glide through the water more efficiently! (Regina Campbell-Malone)

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