HI, my experience of ACFs is limited to rearing five adults from froglets, one batch of two hundred eggs which i raised to froglets and sold to petshops except two who were golden reticulated and im keeping them seperately from the adults till they are a bit bigger, so i would be interested to see if my experiance with them is aytipical. 1. You wrote that these frogs are "generally bold ", i have found that whilst they are growing you can feed them by hand and they come to beg for food, however as soon as they became mature they develop a shyness and like to hide unless a worm hoves into view. This change has been observed in four of my five adults, the fith "Pinky" , a two year old female still exhibits the juvenile behaviour and is constantly begging for food, i put this down to the fact that when i got her she was starving to death in a plecostomus tank in the petshop being fed algae wafers and has developed a food fixation and im sure if given the chance she would eat herself to death. 2. You said they "thrive" as an invading species in England, there were populations on the Isle of White which are now beleived to be extinct, there is a population in Bridgend in Wales (a few miles away from where i live) , i read a study about them online it is beleived that they were the result of one/two releases, the yearly recruitment is low and the population will probally die out with time, interestingly the oldest frog they found was fourteen years old, the frogs were branded for identification. damn run out of room lol