Is a crab a mammal or a reptile?

I'm not gonna fight you on that.

Is a hot dog a sandwich?

Is a burrito a sandwich?

(Yes in New York and Indiana, no in Massachusetts, and the law is silent elsewhere. Personally I believe that because the torta exists, the burrito may have some characteristics of a sandwich but should be considered a wrap)

No, it's a calzone, per https://cuberule.com/

Of course. It's a bologna sandwich in log form.

>It's a bologna sandwich in log form.

Finally someone else realizes that hotdogs are basically just bologna.

The USDA agrees and classified both hotdogs and bologna as "frankfurters"

>"Frankfurters (a.k.a., hot dogs, wieners or bologna) are cooked and/or smoked sausages according to the federal standards of identity."

https://www.fsis.usda.gov/food-safety/safe-food-handling-and...

It's an insect. 6 legs, exoskeleton, etc.

I know you're making a joke about classification, but crabs have 10 legs, not 6.

My bad, I misremembered. 6 walking legs, two swimming legs, two pincer legs.

Logically, a color, green etc., is a 'simple' notion and cannot be explained terms of anything simpler. With color we have to revert to a different description, here wavelength. But wavelength is not human perception (and we can't explain such perception in simpler terms).