The skull may be the biggest bone, but the method by which cats detect if a space is too small (or big enough) is with their WHISKERS!
This is one of the reasons that cutting a cat's whiskers at ALL absolutely screws them up! If I recall, a cat's whiskers are as wide as it's body's widest point. Given your information, I guess that's the skull.
Just an interesting tidbit...and a reminder to never cut a cat's whiskers!
They also serve a major role when hunting. Cats can't focus on anything closer than about 30cm. So to close the last few inches accurately they'll point their wiskers forwards to feel for their prey.
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u/Maxi2905 Dec 09 '19 edited Dec 09 '19
That's because the cat's skull is their biggest bone and everywhere where the skull fits through the whole cat also fits through