A hippo can open its mouth wide enough to fit a 4 foot tall child inside.

Examples of these breeds include: Bulldog, German Shepherd, Collie, Golden Retriever, St Bernard, Greyhound, Bloodhound, Chihuahua, Labrador, Great Dane, Rottweiler, Boxer and Cocker Spaniel.

Seals sleep only one and a half minutes at a time.

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