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The siren is an amphibious humanoid. They are mostly like humans apart from the limbs: Their arms are large and flipper-like, being used to swim underwater. Their leg is short, and they always have type 7 sirenomelia (where there is only one leg with a single femur). They evolved from a hopping humanoid with fused legs, which evolved from a typical walking humanoid

How would they move on land?

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  • $\begingroup$ There's a light discrepancy in your question(s). Do you ask if they could "walk" effectively on land or how can they roam the land effectively (probably supposing they're not that good at walking in the first place)? $\endgroup$
    – Tortliena
    Oct 5 at 19:05
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    $\begingroup$ @Tortliena How they could go on land $\endgroup$ Oct 5 at 19:06
  • $\begingroup$ @IchtysKing I've slightly altered the title to better match your thoughts ;). $\endgroup$
    – Tortliena
    Oct 5 at 19:12
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The closest real mammalian counterpart from a creature like yours in terms of overall bodyplan (arm flippers, feet acting like fins) are seals and sea lions, and sea lions don't quite fit the bill since their 2 legs are still very much capable of acting like decently standard legs, unlike the legs of a seal which are essentially locked in a perpetual backwards position serving more like actual fins with basically no ability to move properly on land.

Therefore, your creature probably moves much like a seal, aka bouncing their way around.

enter image description here

A proper layer of fat might make this easier as well as allow for better insulation against colder temperatures.

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Flipper crawl. Not much extra needed for that sort of thing if their 'arms are large and flipper-like'

enter image description here

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