The animal world always contains surprises that you have never heard in school. The following 15 photos will show you this.

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1. Penguins really have knees.(Photo: BrightSide).

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2. The elephant's legs have a bone structure similar to human legs.(Photo: BrightSide).

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3. This is the sleeping pattern of a owl.(Photo: BrightSide).

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4. Special foot structure of a platypus.(Photo: BrightSide).

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5. Cats do not feel sweet because their tongue does not have a sense of taste.(Photo: BrightSide).

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6. This is a whale's skull.(Photo: BrightSide).

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7. The tail feathers of an elephant.(Photo: BrightSide).

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8. Some starfish can carry squares due to genetic mutations.(Photo: BrightSide).

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9. Chinese deer in vampire-like form with long fangs.(Photo: BrightSide).

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10. Cows don't have upper teeth.(Photo: BrightSide).

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11. Bearded vulture with scary hunting face with colorful fur.(Photo: BrightSide).

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12. The baby elephant has a habit of sucking his cock, like the habit of sucking a child's hand.(Photo: BrightSide).

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13. The door teeth of beaver are orange due to the iron element.(Photo: BrightSide).

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14. Transparent shark eggs.(Photo: BrightSide).

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15. An Indian giant squirrel is multicolored and can be up to 1 meter long.(Photo: BrightSide).

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