If you assumed all vegans eat zero animal products, you assumed incorrectly.
Apparently, some make an exception for oysters. Why?
The reasons why oysters are allowed? Cultivated oysters make up 95% of the oysters consumed but have minimal negative impact on the environment — in fact, they can help improve water quality. (See a tour of an oyster farm in Massachusetts.)
Oysters also don't have a central nervous system, so the theory is that they do not feel pain like we or other animals do.
So while milk, eggs, and even honey are excluded from a vegan diet, some people make exceptions for this popular bivalve. We're not sure if that still qualifies them to be called vegans anymore, but what do you think?
→ Read more: Consider the Oyster from Slate