Bullfrogs are invasive, and do take over and eat many native reptiles and amphibians. I use the exact method of bullfrog control talked about in the article, only I work for state parks. You are correct, newts are toxic, but only the eggs and the adults. Newt larvae, for whatever reason, are harmless, and therefore can be eaten by bullfrogs. In my many years of experience, I have found newt larvae in the stomachs of bullfrogs. But newts are much less effected by the invasive frogs then other species. Newt populations usually tend to hold up fairly well against bullfrogs, unlike California Red Legged frogs, Pacific tree frogs, and the few others that inhabit ponds in my area. It is my belief that the main threat of the frogs is not their mouths, but the space and resources they use. Bullfrogs are territorial, and are too large to have any significant predators. This allows them to take over, and reproduce in great numbers. The tadpoles use up all of the resources in a pond, making it very difficult for other tadpoles to make it to metamorphosis. I believe that the newts can do so well mainly because the larvae are carnivores. They occupy an entirely different niche then the bullfrog tadpoles. It should have been titled "after bullfrogs to save red legged frogs".

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