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  1. The earliest recognisable pseudosuchians popped up about 250 million years ago, and recognisably modern crocodillians have been knocking about for nearly 100 million years of that; they've taken every form from cat sized herbivores to oceanic filter feeders to terrestrial hypercarnivores bigger than bears. They've done pretty much everything, and done it all very well.

    Sharks take the cake though. They've filled nearly every aquatic niche, at almost every size. And they've been physically recognisable as sharks since before trees existed. 420 million years of constant success.

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