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The Mesozoic, or age of the reptiles, is often found at times where there's giant animals were living, towering dinosaurs, huge marine reptiles, winged pterosaurs. But this picture is huge. Just as today's ecosystem is mostly populated by small animals, so were the ancient ones. The different fossilization tends to favor the largest and most robust organisms. Small, fragile creatures rarely make it into the paleontological record. The Mesozoic, or age of the reptiles, is often found at times where there's giant animals were living, towering dinosaurs, winged pterosaurs. The Mesozoic, or age of the reptiles, is often found at times where there's giant animals, varying in size and size. Small, fragile creatures rarely make it into the paleontological record.