Pachyderm, a term formerly used in biological classifications of the elephant, rhinoceros, hippopotamus, tapir, hyrax, and pig. The word, now used chiefly as a mock-scientific synonym for elephant, comes from the Greek for “thick-skinned.”The elephant is considered a pachyderm.
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The stilt is a graceful wading bird related to the avocet. Stilts are found in marshlands and pools and in salty, brackish, and freshwater lakes in tropical and temperate regions throughout the world.
Dinosaur is an extinct reptile that lived on land. Dinosaurs lived from about 230,000,000 to 65,000,000 years ago, during the Mesozoic Era.