The Gray Whales are traveling north to the productive feeding grounds in the Bering and Chukchi Seas in the Arctic. The first wave of the northward migration was mainly composed of juveniles, adult males, and females without calves. Recently, we have also been spotting mother-calf pairs traveling north. All of the mothers and calves will leave the calving lagoons in Mexico by the end of April. The calves will be weaned on the feeding grounds this summer. At the feeding grounds the gray whales will dine on amphipods (shrimp-like crustaceans) that are extremely abundant in the the muddy seafloors of arctic waters. A gray whale gorges on up to a ton of amphipods per day to bulk up its blubber layer in preparation for the migration south in the fall.