Quote Originally Posted by Psychotic View Post
A few reason to consider before mixing different frogs.

1. Most obvious would be size. A lot of frogs will eat anything they can fit into their mouth. Including other frogs.
2. Behavior. Some frogs can be territorial.
3. Closely related species can hybridize. Not a lot of people like hybrids.
4. Toxins. Some frogs secrete toxins which may kill a different species.
5. Depending on the source you might end up with wild caught frogs. They may even be from different parts of the world. A frog may be able to live perfectly fine with his parasites. However the other frog would not have built up any immunity to those same parasites. This can also be the case with captive born specimen. It really depends on where the frogs come from as to if they are parasite free.

I would not mix species unless they where closely related and/or from the same area. For example, I keep American Toads. I wouldn't see a problem also keeping Fowler's Toads in the same enclosure.
Thanks. I think you just created a pretty good check list to consider. With all that you just pointed out anything you can think of that can go with a milk frog? Any tree frogs that might go together? and lastly any tree frogs that might go with regular frogs/toads? or should I just research research research.