You can depict any animal swallowed by a pufferfish with 1 circle.

What is essential is invisible to the eye.

Pelican on a bicycle

More generally, any animal that cannot be drawn in 12 circles cannot be drawn in 13 circles when riding a bicycle. By recursion, no animal can be drawn when riding a stack of seven bicycles.

minecraft sheep

Corals?

centipede

I think so. With 13 circles, I can’t figure out how you could represent more than 26 legs (and other features would be lost).

You can use perspective tricks to only show half the legs

A mature house centipede has 15 pairs of legs. You can probably get the point across with a portion of that, and use two parts of a circle for 2 legs.

I was going to suggest "octopus" but your answer is better.

An owl?

Could be this https://chatgpt.com/canvas/shared/67ed7147fc708191be5b81ed4e...

But not that artsy as the OG.

It was much less of an actual example as it was a reference to the draw the rest of the owl meme