There is a document about alien life forms that mentions four kinds of aliens.

A big gray man with a nose, he reached a secret agreement with the American government.

The second is the little gray man, who was seen in the UFO kidnapping case. They work for the big gray people.

The third kind is blond, looks like a human, and is called Nordic.

The fourth is red hair, which looks like a person and is called orange. They come from Orion, Barnard, Zeta 1 and Zeta 2 in Netherfield.

Scientists speculate that everyone may have the elements of extraterrestrial life.

Some genetic materials may have been exchanged between our ancestors and some alien life forms that visited the earth billions of years ago. Therefore, we should think that the remnants of some selective biochemical systems may have become a part of existing life.