A second theme in the evolution of life is adaptive radiation.$$ Adaptive radiations occur when there are open niches because the original inhabitants of the niche go extinct, populations move to a new habitat or evolve a new major adaptation that opens entirely new niches.

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Which class of animals famously experienced an adaptive radiation into empty niches left when the non$-$avian dinosaurs went extinct? $($Just type one word $-$ the name of the group of animals that radiated after the non$-$avian dinosaurs went extinct.$)$

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