Redrunners are a kind of cockroach, lightning fast. I started using them for my gecko, to increase the challenge level and offer some diverse food. (most crested geckos think locusts taste disgusting!)
They also lack the ability to walk up glass and plastic like dubias, but around here no small sized dubias are sold, so I'm sticking to redrunners & crickets for babies.
Well, I should definately tong train them as soon as possible then, I had a stroke of luck with Bubba, he accepted the first time I offerd. My babies are really grumpy little buggers though lol, headbutting and burrowing down.