Question

why animals back legs are called floating ribs​

Answer 1

Answer:

because they have fur on their body and the fur is floating in air that's why it's called floating ribs

Answer 2

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$the \: phrase \: floating \: rib \: or \: \\ vertebral \: rib \: (latin - costae \: \\ fluctunates) \: refers \: to \: the \: \\ two \: lowermost \: the \: eleventh \: and \\ twelfth \: rib \: pairs \: so \: called \: \\ because \: they \: are \: attached \: only \\ to \: the \: vertebrae - not \: to \: the \\ sternum \: or \: cartialage \: of \: \\ the \: sternum.$