I will give that a read Tom, thanks. I know they have done some studies that show Dendrobatids to be quite "plastic" in their ability to sequester toxins, and that the types of toxins found in the frogs are pretty reflective of the toxins found in the inverts and microinverts of the place. For instance, frogs of species X in one valley tend to have alkaloids representative of the insects in that valley...and frogs of species X in a seperate valley tend to have alkaloids representative of that specific valley. Given that inverts and microinverts are consuming the alkaloids from the plants of each valley, and the frogs are then consuming the inverts...it makes sense. Makes one rather cautious about feeding field sweepings to certain species...