Mammals both produce milk and have hair. Ergo, a coconut is a mammal.
I know you’re being facetious, but this is an actual issue with morphology-based phylogeny.
*leans over and whispers to person beside me* what are they talking about
*leans over and whispers back* Human ability to quantify and categorize natural phenomena is sketchy at best and wildly misleading at worst
consider the coconut
this reminds me of that time Plato defined humans as “featherless bipeds” and Diogenes ran in with a plucked chicken screaming “BEHOLD A MAN!”