Originally Posted by Ed
This cannot be used as a broad based rule with species that are strongly territorial as the competition for niches and resources can be just as intense between the species as within a species. A reputable source reported about a male O. pumilio repeatedly attaching a D. tinctorius in an attempt to drive it from the tank... this is an example of different species same behaviors, same shape.. d
Ed, I'm not saying that a male XXX won't attack a male YYY. I'm saying a male XXX generally wont attack a male YYY any more than he'd attack another male XXX.
Interspecies aggression most certainly can happen, but so can intraspecies aggression. The case above, from an aggression standpoint, most likely would have had the same resolution if the 2nd frog was another male O.pumilio, as it did with the tinc.
In this specific case, we're talking about two species that wont tolerate other same species pairs, so its not a surprise they won't tolerate off-species (but similar looking) pairs.