How could a non round land creature puff up like a balloon?
I've got this ferret shaped land creature from a dream that can make its body expand so it looks sorta like a fat sausage with limbs. It sucks in air with its big mouth to expand. It lives on a world with a thick atmosphere.
I've got this idea for how it might could work, but I want some people more knowledgeable than I am in this area to critique it.
I wish to know whether or not this would work in a living creature: Perhaps under its thick skin layer there is a cavity all around its main body (cavity is not in the limbs). There are many wire like structures connecting the skin layer to rest of the body so it is still attached and can receive blood flow. The creature can make sucked in air go to there through two openings in its throat protected by a filter. There are also two openings near its back legs where air can be expelled from this cavity at will. This also makes it able to suck and expel air at the same time so it can suck in air as long as it wants till it gets tired. It can thus vacuum up prey like Kirby. I suppose it is also to make itself bigger to discourage attackers. Its skin probably looks wrinkly and baggy when not expanded.
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