some tarantulas have weird habits. they dont just always sit around. my first, a wooly, would find unusual ways to sit down, from curling his legs underneath him to only on one side curled, or he'd cross his legs.
they arent too bright though. i'd find him stuck to the screen of his aquarium, as their legs have small hooks. sometimes i'd find him hanging off the screen by one leg, been there for hours i assume, just hanging around. watching them groom themselves is also interesting. taking two or three legs and rubbing them across their underside, and across the other legs, kind of like how a cat will groom itself. watching them molt (shed their old skin) is also a treat.
having one or two is no real challenge. especially if they all have the same temperament. the rose hairs and woolys are tame and dont get spooked by too much. but the baboon's are very nervous and will jump in the air as much as 4 feet! not to mention that they can move with lightning speed.
the stoutleg will emit a buzzing noise when its fending off a predator (or anything it thinks is a predator). it will rub its fangs up and down (left up right down, repeat) faster and faster, and its quite an audible 'buzz' from the hairs.
then there are species like the thai black or the cobalt blue, which are fast, aggressive and downright evil. they will play possum and wont move for anything, then will strike out, not only biting with their fangs, but using their front two legs as clubs, and will clobber their target. my thai black is about the only one who will do such when i mess with her tank and she always bares her fangs at me.
the striped knee is a bit weirder. i've had him for about 8 months, and i can count on one hand how many times he has chosen to eat. i've tried feeding him pinkys but he'll just kill them, biting them over and over, sometimes then holding them in his water dish, and will hang on to them for several hours. he refused to eat any grasshoppers, and has eaten very few crickets. his abdomen looks very shrunken, and i can only assume thats how he would behave in his natural environment.
the pinktoe is very popular because of its pink markings, and some species of pinktoe will have green or blue colorations as well.
and if you really want to see a beautiful spider, check out any one of the ornamentals.
regular spiders are boring. but tarantulas offer a lot more variety. scorpions tend to be more active. my two emporers just ate a pinky each last night, and they were both fighting each other for a spot to eat their meal at. neither was satisfied where they were at, they wanted to be right where the other was.