Check this one out.
A fellow called Dante Sentori claims to have come upon a book called alien races from a Ukrainian friends father who was a former diplomat in portuguel. Although the book was written in russian. Petro, friend of dante, could read russian and dante wrote it out in english as petro read it.
According to this book there is suppose to be 58 races here and the link to the book has it as a flash book for those who wish to read it.
This is a page showing the tall whites which I firmly believe are shape shifters as does the books description of the tall whites.
(http://s18.postimg.org/ocweb9bq1/tallwhite.jpg)
These aliens can appear from nowhere and since they shape shift, can be anything to you.
The link to the flash book: http://en.calameo.com/read/002667888b58fe4b9c77d
A Dante interview:
http://www.youtube.com/watch?v=Ia4Abuopj_o