Hi, Fruit Flies are tiny brown flies that love fruit. They are too small for your adult Whistlers.

Breeding mealworms is very easy. It takes a while to get the cycle going but once you do then you have plenty. You can Google it and get heaps of info so i will just give you a quick out line. I use those plastic type draws that you can get cheep at the warehouse. I fill one draw with 10cm of Rolled oats or you can use Wheat Bran. Put your mealworms in and throw in potato and/or carrot. Change the veg when it starts to show mould. You must keep the mealworms dry. They don't need water. Then you will notice the worms turn into these white larvae which is the meal worm pupae. You must pick these out because the meal worms will eat them, Beatles will too. I just put them in a container. When you see them change to bettles then you put them in the second draw in the Roll oats/ bran substrate. Also put potato/carrots in. I also put toilet rolls for the beetles to hide in. After quite a while the bettles will lay eggs which take up to 19 days to hatch. It takes ages before you notice the baby meal worms but when you do shift the bettles into the third draw onto new substrate. Then you just keep it going. The whole life cycle takes about a year. The warmer the better as they progress faster. I keep mine in the garage in the summer and move them inside in the winter. I don't use heating. You also need to sieve the meal worm out of the old substrate and replace it every now and again.

Hibernating...I just watch my frogs as it's starts to cool. You will notice that they slow down with their eating and they dig down in the substrate and eventually they don't come out. They usually hibernate all winter. Sometimes if its a really nice day I might see one come up but most of the time they are in their substrate.

Im a bit on the tired side so i hope this makes sense to you and I hope this helps.