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The Mesozoic era is famously the 'Age of Dinosaurs'. Gymnosperms (like conifers) were the dominant plants. Modern birds (Neornithes) appeared towards the end of the Mesozoic (Cretaceous) or early Cenozoic. Saying it was the 'Age of Birds' is incorrect, as birds diversified and became dominant in the following Cenozoic era. The Cenozoic is often called the 'Age of Mammals' and also the 'Age of Birds'.