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A butterfly can mate with another butterfly to produce fertile offspring only if the two butterflies belong to the same _____.

This question is referring to the concept of speciation and the definition of what makes a particular group of organisms its own species. There are various ways to define a species, but the biological species concept is a widely accepted and commonly used method. The biological species concept states that a species is a group of individuals that can interbreed to produce fertile offspring. This means that if two individuals are not of the same species, they either cannot breed at all or cannot produce fertile offspring. 

This brings me to one of my favorite examples. When a horse and donkey mate, the offspring is called a mule. Mules are sterile and cannot produce their own offspring. Therefore, even though the horse and donkey produced offspring, it's not fertile offspring, so the horse and donkey are considered two separate species. Two horses, however, are of the same species because they can produce fertile offspring. Butterflies would be no different. They would only be able to mate and produce fertile offspring if they are of the same species.


However, it seems that there are always exceptions to the rules when it comes to speciation. The article I linked to below describes how the Appalachian tiger swallowtail butterfly is officially its own species, but genetic analysis has shown us that it is indeed a hybrid between the Eastern tiger swallowtail and the Canadian tiger swallowtail. 


Speciation is a fascinating topic that is full of unique stories of how species recognize each other, who can mate with who, how environment plays a role, and how groups separate and become their own species.

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