[rossdavidh]

No doubt it could be over-interpreted, but seeing toxo correlate with risk-taking behavior in enough different species, does seem to increase the plausibility, otherwise we need special pleading that we have several different spurious correlations all pointing in the same direction.

However, and maybe this is what you're getting at, it could be that risk-taking individuals are more likely to get infected with toxo? Telling the difference between those two ideas would be harder, although in lab rat experiments you could control for it.