Most Thick-Skinned Animals in the World

Thick skin: Up to 5 cm (2 inches) thick.

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Rhinoceros

Thick skin: Up to 5 cm (2 inches) thick.

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Hippopotamus

Thick skin: Tough, armored, and scaly with bony plates (osteoderms) beneath.

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Crocodiles

Thick skin: Covered with bony, armored plates.

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Armadillo

Thick skin: Shielded by a hard shell made of keratin (same material as human nails).

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Tortoise

Thick skin: Covered in tough, overlapping keratin scales.

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Giant Pangolin

Thick skin: Their skin is quite tough, especially on the back and shoulders.

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Warthog