The Zetas are the ones involved in the cattle mutilations. They absorb certain substances from parts of the cattle that stabilize them during the cloning process. This can be placed under the tongue to give sustenance and stability for some time. It is a substance that comes from certain mucus membranes: the lips, nose, genitals and rectum, and also from certain organs. These glandular substances serve as nutrients in lieu of eating. Resting the substances under the tongue is not the only way they get nutrition. You may have noticed that the cattle mutilations generally result in all the blood being drained from the body. The Zetas have in their bases canisters and vats in which animal and human organs float along with a purple liquid to hold these parts in suspension.
The Zetas swim in the mixture and absorb the nutrients through their skin. They use hydrogen peroxide in both the absorption and elimination process. The hydrogen peroxide also helps to preserve the liquid and organ mixture to keep it from spoiling. They have no digestive tract and eliminate through the skin. To eliminate, they need to pass the substance through some part of their body, much the same way plants eliminate through their skin or outer shells. They use hydrogen peroxide for helping with that elimination as well. The Zetas have also been referred to as the Little Green Men because they tend to turn a shade of green when they have not received sufficient food. When they are in this state, they are very vicious. The cloning of these aliens can be done quite quickly, reproducing synthetic replicas. They have a technology that is much beyond that of humans and that has led to the agreements with the United States government whereby exchanges of these techniques could occur.
The Zeta Reticuli Greys are not masters of their own fate. They are, rather, subservient to a reptilian race of people from their home planet. The Zetas seek, but are fearful of, freedom from their masters. They seem to have some desire to work closely with humans in an effort to retain the freedom they have on earth, which they have never experienced before. In their desire to retain that freedom from their reptilian masters, they would hope to play the role of being masters here on earth, or at least having enough control so as to be safe from slavery by any other species.
The Zetas are of two social classes, one being hawkish, the other more dove-like. The more dove-like Zetas are more refined and capable of more business-like behavior toward humans, while the other type is more abrupt, blunt and crude in their directness. The Zetas desire the help of humans in an expected future confrontation with the reptilian masters who are expected to follow soon, within the next 20 years. This refers to the so-called asteroid that is on its way toward earth. It is housing approximately 30 million reptilian aliens. It has, however, temporarily diverted its path as it moves into the constellation of Draco.