mythical.creatures.

The conversations that occur after several late nights of baseball viewing are amusing. The most recent case involved the unicorn vs. the pegasus. After agreeing that the pegasus is a horse with wings, and the unicorn is a horse with a horn, we questioned whether there could be a horse with both wings and a horn, and if so, what it would be called. Pegacorn? Unisus? The ensuing web search proved hilarious. Here are some of the results:

Q: Is a winged unicorn and a horned pegasus the same thing?
A: A unicorn is a horse with a horn and a pegasus is a horse with wings. Therefore a winged unicorn would be a horse with a horn and wings. A horned pegasus would then be a horse with wings and a horn. I would then say that they are both the same. But, if you were to consider the unicorns magic powers, the pegasus with a horn might not inherit these powers. I hope I helped, Miranda
A(2): They might look the same, but the powers that they both have, is very different!
(wikianswers)

A: On the subject of the word alicorn, it is, as far as I know, a cobination of the latin 'ali' (wing) and 'cornus' (horn), so I will continue to use it for winged unicorns until someone convinces me otherwise. Transparent wings are fun to draw. (Followed by a drawing of an "alicorn" with transparent wings.) (elfwood.com)

And my personal favorite...

Q: Can human beings alter DNA of a horse to make it a unicorn or pegasus?
A: No. Horse DNA doesn't contain code for a horn or wings, so we would need to graft these features from another animal. So far cross-species grafting techniques are not nearly sophisticated enough to give a horse wings, though we could theoretically make horse bioluminesent, so we could have glowing horses ;) (eduqna.com)

There were several more I can't find right now that discussed the actual presence of unicorns and pegasuses. Those were hilarious. So while we didn't come to any definitive conclusions, we sure laughed enough at all the people out there who spend their time posting about mythical creatures.