i used to keep alot of them..mine were all aggressive.
the largest i had was nearly a foot long.
slept behind a bookshelf, and would come out at night and eat the mice we put on the stereo speaker.
they give seriously mean bites, and upon occasion, they did NOT want to let go..biting harder and harder the more you tried.
even waving rubbing alcohol under their noses or putting them under water did not make them let go.
btw..they can leap five feet,
lol..those were the days.
one bit of advice is to not pester them..they are reclusive and get stressed out super easily.
Years ago I had a huge one that escaped out of his cage and somehow made it outside and lived on the backyard patio for years. On summer nights he would come out and "bark" the tokay call. When it started getting cooler I would catch him and keep him inside until it warmed up. Interesting lizard despite the attitude.
I love tokays, one of my favorite lizards. I used to have a breeding trio in a large arboreal vivarium in my living room and they were so much fun to watch. One of the females bit the heck out of me one time, I still have a scar over one of the knuckles on my right hand.
Beautiful specimen in your pic, definitely makes me want to own them again. I've also kept Gekko vittatus in the past and they're fun, too.