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The bill of the Gadwall Duck, showing the comb-like 'teeth' that they are known for.

Bill of Gadwall

The bill of the Gadwall Duck, showing the comb-like 'teeth' that they are known for.

The long-tailed pangolin (Manis tetradactyla) are known as scaly anteaters because of the large keratin scales used for defense.

Long-Tailed Pangolin

The long-tailed pangolin (Manis tetradactyla) are known as scaly anteaters because of the large keratin…