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Gentoo Penguins can dive as deep as 200 meters and stay underwater up to 7 minutes. During deep dives, Gentoo penguins reduce their heart rate from 80-100 beats per minute (bpm) down to 20 bpm. After breeding, female Gentoo’s lay two eggs that weigh about 130g each (4.6 ounces). Gentoo parents then switch incubation duties on a daily basis. The incubation period lasts about 35 days, and then the Gentoo penguin chicks stay in the nest another 30 days before forming crèches. Petermann Island, Antarctica
Humpback whales typically migrate up to 25,000 km (16,000 mi) each year. They feed in polar waters, and migrate to tropical or subtropical waters to breed and give birth, fasting and living off their fat reserves. Their diet consists mostly of krill and small fish. Humpback whale (Megaptera novaeangliae) is a species of baleen whale. Adults range in length from 12–16 m (39–52 ft) and weigh around 25–30 metric tons. The humpback has a distinctive body shape, with long pectoral fins and a knobbly head. South Shetland Islands, Antarctica
