Quote:
Originally Posted by myrmidon
I hadn't thought of starfish. But I was thinking of animals that walk upright. As far as I can recall, all land-based animals are bilateral (and even most mobile marine life).
Thinking about it, the aliens in 'Arrival' were similar to a jellyfish, which is multilateral?
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Most of the animals people immediately think of are vertebrates, which are a clade pretty far down the lines of development.
Arthropods are bilateral too, to be sure.
Both of those groups established themselves as bilateral before becoming terrestrial, though.