Wow very cool! I kept mantises as pets when I was a kid, my wife too. We both find them very fascinating. Lizards and Mantises were the pets I kept when I was a kid, until I went to parakeets, cockatiels, and pigeons later on in life.
Mantises are really easy to care for and super easy to feed - as long as they have a big enough enclosure and some twigs/branches to hang on. Spraying them with water and watching them drink was a lot of fun to watch.
When I was a kid, they seemed to be everywhere, now I rarely see them but I'm not really looking. Love them because they eat pests.