I love reptiles, they just don't communicate in same way dogs and cats do. I had a Chinese water dragon for over ten years and he was extremely mellow, he would never purposefully bite me and he never showed aggression. When he was afraid, he would puff himself up really big rather than open his mouth to bite. I took him to a reptile specialist when he needed to go to the vet and the specialist said "This is the most mellow lizard I've ever seen".
The thing is, so many people think reptiles need to be kept in a tank and gawked at and fed like fish only and that's all there is to them. They need to be handled and receive regular interaction with their caretaker, that's what makes them non-aggressive. They also have their own mannerisms, my lizard would wave his arms around as if to say hello, he was very active when he was happy and healthy and inactive when he was sick, he would also lick my hand like a dog and he liked to swim and catch fish. He also had a really extreme fascination with shiny objects.
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He was very high maintenance though and that can be something that (thankfully) puts a lot of people off of reptiles. If lizards like my water dragon become popular and people buy them and don't take care of them properly, that only hurts the lizard in the end and they do take a lot of time and effort.
Some of them (like my water dragon) have very specific needs that need to be fulfilled, his food needed specific vitamins, his tank needed to be kept at the right temperature and the right humidity level, He needed UVA and UVB lamps, he needed a constant source of running water and a habitat that mimicked the rain forest, substrate he wouldn't accidentally eat, plants that weren't harmful and of course all that makes a breeding ground for bacteria.
For as much as I loved my water dragon, I wouldn't ever buy another one, my life is just too busy right now, instead I'd buy a more low maintenance reptile like a beardy or a corn snake (they'd of course get the same amount of handling and love though). I also don't believe anyone should ever buy a lizard or a snake that will get big enough to eat a cat, unless you run a zoo, most people can't take care of them properly and they end up released into the everglades specifically. I would especially not buy a monitor, iguanas are at least vegetarians and really only get aggressive during the mating season, monitors though, they're pretty much mini komodo dragons, including the very dangerous, bacteria infested bite, that first video makes me cringe, it's true, handling them makes them non-aggressive, but accidents do happen and to me, having that lizard's jaws so close to my throat and with those claws, you mine as well be snuggling up with a bobcat.
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I also enjoy watching the lizards in my backyard, they have this whole fascinating pecking order. The big dude rules the territory and the little ones climb up branches and stuff (and always face down) so they can keep watch over the grounds, when a young upstart crosses into the territory (the borderline is where the driveway meets the dirt), the big guy confronts him and they do push-ups and flex like they're on an episode of Jersey Shore, if that's not enough to deter the intruder, the big dude chases him off.
There's also a gecko that's found a strategic hunting spot between a lamp and the wall. It hides there all day waiting for night when the moths are attracted to the light and instant buffet.
The black racers peek their heads up over the grass to see where their going like para-scopes. They're also curious to a pain in the ass degree and ballsy. One thing they won't tangle with though is larger, more dangerous snakes, instead they run like hell, so if you ever see five black racers moving in the same direction, there's probably a rattle snake or a water moccasin in the opposite direction and you should probably avoid.