In biogeography, the modern fauna of the world considered as a single unified region, especially the faunas that developed after the Mesozoic era.
From Greek kainos (new, recent) + gaia (earth), literally 'new earth.' The term was coined in the 19th century to distinguish modern animal distributions from earlier geological periods.
This term reflects how dramatically different our planet's animal life became after dinosaurs went extinct—it's like Earth got a complete makeover of its inhabitants!
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