Remember how I pointed out that tankpeople are kinda cat-like? It's the most prevalent with their bathroom habits....

Steve is the only tankperson (well, tankman, tankling (he's 16)) we have seen use the bathroom onscreen and have you noticed he always aims for the soil? That's what cats do! And we never see Steve finish but I assume like a cat, he covers his urine puddle when he's done. (Simply by kicking soil over it, and probably taking a step further and smoothening it with his feet) So, given Steve, I assume all of Mars does it, where the planet's population just uses the Martian soil as one giant litterbox. (So, there's probably aged waste every cubic meter on Mars and some spots have more waste than others)

But, in my webseries, I feel like giving the tankpeople a few cat-like characteristics, not just treating Mars like one giant litterbox because it's instinctual. They are aliens after all so they won't act 100% human

What cat-like characteristics should I give them? I am limiting it down to 3 because of how human-like the tankpeople are. And we know the first one is bathroom habits, which I will be keeping. (Except, I will show tankpeople covering their waste when they finish, e.g., when Steve finishes peeing, he will gently kick soil over his puddle and smoothen the soil with his foot before walking off) What will the others be?

The second will be "purring", but unlike cats, tankpeople will purr when they experience euphoria. And newborn tankbabies, like kittens will "purr" when nursing and being held, but they grow out if "purring" after 1 month of life and will only "purr" when experiencing euphoria.

And the third and final is, the way tankbabies play, they will play like human babies and put stuff in their mouths, press buttons, etc. and they will actually play like a kitten.

Where the tankbaby will lay on the floor with the toy and wrestle it and bat at things with hands.

Just adding this, in my webseries, tankpeople will act mostly human but also a little like cats too.