Right, so - the thing about magic is that it works largely in concepts and perception; I could REALLY simplify it by saying that ritual spells, for example, work because we expect their components to do something, and while that's a pretty significant oversimplification, it's also not totally untrue.
While that element isn't quite as directly relevant to biology, since it's not being intentionally "cast", it's still kind of... a thing. To some degree, magic effects that crop up natually in animals are usually connected in some way; it's very often just a matter of finding out how.
Hence, cats' extra eyes might be directly related to their being lucky, or there could be a third factor here - that being the root mode of interaction between the magic and their bodies. ...Which would get into a level of understanding of the esoteric sciences that I didn't quite hit in community college.
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While that element isn't quite as directly relevant to biology, since it's not being intentionally "cast", it's still kind of... a thing. To some degree, magic effects that crop up natually in animals are usually connected in some way; it's very often just a matter of finding out how.
Hence, cats' extra eyes might be directly related to their being lucky, or there could be a third factor here - that being the root mode of interaction between the magic and their bodies. ...Which would get into a level of understanding of the esoteric sciences that I didn't quite hit in community college.