Not using punctuation or capitalization is an indication of subpar communication skills and requires linguistic help. Also, it means I’m not very likely to take you seriously.
If I believed I were physically an animal that would be psychosis. I am fully aware, however, that my body and at least part of my mind are human. Anyone who knows me personally will tell you that I am an odd but extremely logical, grounded person; if anything, I spend more time in reality because my mind works the way it does.
I do not believe I am a snow leopard, I believe that I perceive and experience the world in a way more like a snow leopard than like a human.
See, this almost concerns me more than the people who are just like “NO MY SOUL IS A WOLF TRAPPED IN HUMAN FLESH.” This is an attempt to actually rationalize experiencing life as a non-human, all the while calling herself an “extremely logical, grounded person.”
So, out of curiosity, how do you perceive life more like a snow leopard than a human? Consider, of course, that all of your senses function significantly different of your admittedly human body, so on a very basic level it’s actually quite impossible for you to experience the world as a snow leopard does. Also consider that you really don’t have any concrete, first-person knowledge of how a snow leopard thinks or perceives the world, so any contrast you can form between human and snow leopard thoughts is unspecific at best and just guesswork at worst. Also, I suppose I should probably ask how you manage to be a leopard and a little of 3 birds. How’d you find which were the right birds, especially considering the above? And surely it has to be a coincidence that all of creatures you identify as are ones that popular culture would call cool.
The way I experience and interact with the world is very different from what I perceive to be the norm. Some of the ways it is different could be explained with documented disorders (I have sensory processing issues, for example), but many cannot. I have mental and behavioral tendencies that seem to be derived from feline instincts, mainly involving hunting, physical movement, and social interaction. A concrete example would be my visual hierarchy, which is nearly backwards. These things alone could just be mental and behavioral oddities, but I also feel an incredibly strong connection to snow leopards and to the non-human world in general. I feel no such connection to humanity, despite having a human body and living a relatively human life. Without that feeling of connection my assertion that I perceive the world more like a snow leopard does would be, as you say, unspecific guesswork.
I also experience sensations involving limbs that I do not physically have. I constantly feel feline ears and a tail, and often I will “have” other body parts, as well. While it is very possible to conjure up such sensations with the power of the human brain, without any prompting on my part my non-existent limbs will appear and disappear and react to my environment. They can be a pain in the butt (pun intended) sometimes, but I don’t appear to have a choice in the matter.
Like many therians, I have always simply known what species I identify with/as. The birds are actually not the ones I would choose if I had the opportunity to do so. I think barn owls are extremely beautiful, while barred owls are more generic and dumpy-looking and have a silly-sounding call. Gyrfalcons are too big; I would rather be a smaller falcon that isn’t traditionally used by humans for hunting. Red-tailed hawks are part-time scavengers, obnoxiusly common, and aren’t much to look at compared to a lot of other hawks/buzzards (plus, I prefer other types of raptors). I think it would be awesome to be an “uncool” animal like a salamander or a moth. Having multiple predator mindsets can get a little repetitive (though usually the bird parts of me are only meta-physical).
A lot of therians are not “cool” animals, but the large number that are has spurred a lot of debate within the community. Some people think that it is because mammals and predators resemble humans more than other animals do; others think it is because a lot of those animals are going extinct and their souls are going elsewhere. Others, like myself, have no real explanation.
There is no way I can prove to you that therianthropy is legitimate short of letting you borrow my brain for a day (which is, of course, impossible), so if you want to believe I’m deluding myself when I say I experience the world in a nonhuman way I definitely won’t hold it against you. If I weren’t a therian myself I would never believe it was a real phenomenon.