Seeing Double

While most people are only familiar with identical and fraternal twins, there are actually 7 different types of twins. They are: identical, fraternal, half-identical, mirror image twins, mixed chromosome twins, superfecundation, and superfetation.
This is a blog for mostly twin things - pictures, facts, gifs, quotes, and stories - but also fandom things once in awhile (Harry Potter, Doctor Who, Supernatural, Sherlock, etc) and possibly some photography.