Maybe it takes longer than 200,000 years to get here. Aliens probably came here to visit the dinosaurs and brought the first mammals (rats) aboard their ships. Then they sent a colony ship but the electronics malfunction and it turned into a ball of ice that impacted earth killing off the dinosaurs.
To a highly advanced species do you think we would look more like dolphins or cockroaches? Do you think insects know what fish are? Fish know what insects are; protein. But do you think a roach would even notice a fish?
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