giant vs dwarf

[GrifTheGreat]

see that is why I'm not finding any whys except possible cannibalism, that is an issue keeping same species frogs together too, big males will eat small ones ( or attempt to), big males will bully smaller ones and so on.
if eliminate that factor and keep animals close in size, say a male dwarf and females giants or females of both species. or small giant male with big dwarf....

Bullying isn't only done by large males. A large female is just as likely to bully a smaller male or female. Each species of frog has their own secretions as well so you should take that into consideration. These two species may live close together, but as far as I know they don't hang out together in the same water holes or anywhere close.

I'm not going to say don't do it, but I myself would not.

[Herpguy]

I really don't think that cannibalism is as big an issue with these frogs as people think. I have never witnessed nor heard of cannibalism actually happening when adult or even subadult specimens are concerned, and I have seen pretty huge size differences kept together. I really wouldn't push it with keeping a female dwarf and a male adspersus together, but I don't see why these species couldn't be kept together. I would be willing to bet that interbreeding could happen genetically speaking, but physically, it would be impossible. These species have such different methods of reproduction that they really would not be compatible. It would only happen if somebody used manual fertilization.

[GrifTheGreat]

I really don't think that cannibalism is as big an issue with these frogs as people think. I have never witnessed nor heard of cannibalism actually happening when adult or even subadult specimens are concerned, and I have seen pretty huge size differences kept together. I really wouldn't push it with keeping a female dwarf and a male adspersus together, but I don't see why these species couldn't be kept together. I would be willing to bet that interbreeding could happen genetically speaking, but physically, it would be impossible. These species have such different methods of reproduction that they really would not be compatible. It would only happen if somebody used manual fertilization.

I believe the youngsters and juviniles are the cannibals, not so much the adults and subadults.