For me, it's dogs. I have been obsessed with dogs, my world filled with dogs, dogs have been my LIFE at least since I was a year old and able to crawl (my mother tells me she remembers me obsessively trying to get near the Lhasa she had at the time whenever she put me on the floor). I can't remember not being able to understand exactly what my dogs are thinking and feeling, and when I was younger especially I used to mimic canine behavior (my mom once got called by my preschool teacher because I was imitating a canine play-bow in class). Now I automatically cross-reference human behavior and body language in my mind with the canine sort in order to better understand people. I can tell when a dog is worried, tired, upset, angry, about to bite, thinking, wanting to play, suppliant, about to run around and go into 'hyperactive mode,' impatient, frustrated... I've never met a dog that didn't like me, either. I have been thinking about going into Animal Behavior and focusing on canids in college lately, actually.
I do think that my affinity for dogs is closely linked to my AS, because it has given me much more of an insight into how dogs feel and think. For one thing, as I said above, dogs have been my obsession/special interest for literally as long as I can remember. In fifteen years, I have collected a HUGE amount of information about them in my mind, and the years of constant observation of every single dog I see helps me to learn more. Secondly, my sensory issues include an extremely good nose, which helps me to orient much more on smell in the same way that dogs do and better understand them in that way (I can tell both of my dogs apart by scent, for example). Third, some of my AS oddities are that I don't enjoy hugs at ALL although I do like curling up next to people I love--in other words, I have a lot of the same preferences about touching that most of the dogs I've met have, with the exception that I'm a lot less pleased about being touched by strangers than some dogs.
Which reminds me: I wish Temple Grandin would LEAVE THE DOGS ALONE. She had a section on them in one of her books, and she clearly demonstrated that she did not know nearly as much about them as she does about livestock (she advocated breed-specific legislation, for one thing, which has been shown to be absolutely worthless when it comes to actually preventing canine aggression incidents, and she equated pale skin and white fur in dogs with unstable temperaments although a large percentage of breeds in the group of flock-guarding dogs, one of the most temperamentally stable, gentle with their flocks, independant and confident groups of breeds, only come with white coats). Really ticked me off.
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cogito, ergo sum.
non cogitas, ergo non es.