|This article is probably off-topic, but tolerated because it's relevant and/or popular on /tg/... or we just can't be bothered to delete it.|
There are a particular Furry species that have sparked interest in many newcomers, The Protogen and Primagen. As described by the Urban Dictionary: Protogens are "Artificial beings that are tasked with a multitude of things across the Universe." They are an extra-terrestrial bio-artificial species that are tasked with discovering and adapting to different planets and environments. Their origin is unknown, but they seem to have originated outside of the Milky Way. Their prime directive is to seek to find life, many assuming roles due to their current environment. Most protogens are usually docile unless threatened.
Before Protogens, there were only a single species, the Primagen, they have a raptor-like appearance and a long visor. Primagens are 70% artificial and don't have a functioning digestive tract, and are usually 7-8ft tall. They get the name "Primagen" from the word "Primogenitor", even though in lore Protogens came first. Primagen OCs are a "closed species" and can only be acquired via auctions for upwards of $1000, unless you would like to create your own, which is not illegal, but highly frowned upon.
After many complaints about how expensive Primagens were, the creator decided to make a new, open species, the Protogen. Protogens are smaller and don't have the raptor-like appearance of their more feral counterparts. They are less mechanical than Primagens, about 40% of their body is artificial. They have functional biological organs, including circulatory and digestive. Protogens behave like mammals, have biological ears, have a shorter, more rounded visor compared to Primagens, and they are usually 6ft tall.
Both Primagens and Protogens use a super-intelligent neural AI they use in tandem with their natural brain, they both are great at problem-solving and are extremely smart. Both species became smart enough to become independent from their creators and roam the Galaxy instead of taking orders.
The most unique feature of both species is their Nanite visor, as it displays emotions and their status. The way these visors work is shown in the gallery, but what makes the emotions so fluid is the liquid-like nanites in their visors. It is most likely that their AI and brain in tandem control the nanites. The artificial metallic parts on each of the species are made of super-strong ultra-light metals, currently known as Bulk Metallic Glasses (BMGs). Further reading on BMGs is available here: BMG Wikipedia
The circuitry and/or biological systems of the species are quite complex. The electronics are powered by the “blood” of the protogen, which is a liquid fluoride-thorium reactor system, contained within the breastplate of a protogen. The biological systems, on the other hand, are powered from the intake of food and oxygen. Eating can only be achieved by physically intake of calories (see Visor Mechanics). Though the species does have a rectal system, it is not needed due to the efficiency of their intake, which is 100%. Oxygen intake can be achieved in one of two ways: breathing naturally, or internal oxygen-enhanced air reserves.
The visors of the protogens are complex and not fully understood at this time. What we do know is from manufacturing patents and leaks. A redditor, RJDaBeast11, has made a helpful diagram of the leaked and presumed mechanics. You can view the diagram here. From what we have observed, protogens, in fact, can open their visors, contrary to popular belief.
Protogens and sergals (the characters, not the real-life fans) don't get along with each other. Protogens mock sergals for their cheese-shaped heads while sergals claim that a protogen is just a sergal with an iPad taped to its face, which is a really good way to make a protogen mad.