Goldfish can learn to remember things for months.
A pet goldfish can learn where its food comes from and swim right over at feeding time.
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A dog's nose print is one of a kind, like your fingerprint.
Cats purr, and it may help them feel calm and cozy.
Hamsters stuff food in their cheek pouches to carry it home.
A guinea pig "popcorns" — it hops in the air when it's happy.
The tallest dogs can look a grown-up right in the eye when standing up.