Like, when you pet a dog/cat, their skin is sort of looser, they have a scruff of the neck and lots of rolls. But in humans, the skin is tight on the meat, even on the hairy parts like the scalp. Is there a reason for this?
In: Biology
What everyone else said but also certain injuries that they may receive, like a tear in their esophagus for example, can cause the space between their bodies and their skin to blow up like a balloon. It is called subcutaneous emphysema. I am not sure what the evolutionary advantage to this is but once the air starts to go down you can pet them on the head it feels like very tiny bubble wrap popping under their skin each time you touch them. Not a very suitable explanation for a five year old, but hopefully interesting.
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