Im not a traditional 6 day kreationist. The word used for day can mean " period of time " so i have abit diffrent view.
But this thread is not discussing the biblical creation, it is looking at the feasibility of Noah's ark. The issue of kinds is brought up to reduce the number of animals the ark was expected to house (and feed, water, muck out etc.), just as you used it earlier for dogs and insects.
On this page it looks at the evolution of cats, another favourite 'kind' cited by creationists. Note that from genetic studies it is found that modern cats evolved from a common ancestor approximately 10 million years ago. So either evolution occurred almost 2000 times faster than science describes, or Noah's ark and the flood occurred at least 10 million years ago. But that just goes for modern cats. The same study also looked at species which are genetically closely related, including the genet, linsang, fossa, mongoose and hyaena. Would yo class them in the same kind as cats, and what would you base your decision on?
And if it takes this long for cats to differentiate, how long would it take for the beetle and butterfly posted by Dr. Adequate to differentaite from a common 'kind'?