I'm not saying the one you pictured was a bird but if your talking about them evolving then maybe as they got smaller then the tail would obviously become a lot smaller too and it does show that not all dinosaurs were reptile like. It's all just speculation and theory though when all you haveto study is their bones. Cockroaches are very resistant to radiation, not sure about rats. Depending on exposure though if there was enough radiation then even they wouldnt be able to survive
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