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A six-day-old hippopotamus is pictured next to his mother, Kara, aged 21, at Planet Sauvage (wild planet) zoo in Port-Saint-Pere, western France

A six-day-old hippopotamus is pictured next to his mother, Kara, aged 21, at Planet Sauvage (wild planet) zoo in Port-Saint-Pere, western France

Olivia, a rare pygmy hippo, was born at just 13 pounds this past August at Sweden's Parken Zoo

Olivia, a rare pygmy hippo, was born at just 13 pounds this past August at Sweden's Parken Zoo

15 Laziest Animals -- HIPPO Sleeps For: 16-20 hours a day  Snooze Stats: Hippos that stay together sleep together. They tend to take naps in groups of up to 30. Although they can sleep on land, hippos are also able to sleep underwater. During their underwater slumber, they must rise to the surface for air, but are still asleep during this activity we humans might refer to as "sleep snorkeling."

15 Laziest Animals -- HIPPO Sleeps For: 16-20 hours a day Snooze Stats: Hippos that stay together sleep together. They tend to take naps in groups of up to 30. Although they can sleep on land, hippos are also able to sleep underwater. During their underwater slumber, they must rise to the surface for air, but are still asleep during this activity we humans might refer to as "sleep snorkeling."