I recently read an article about Organo-phosphate based fertilizer, this with a combination of Insecticidal Petroleum based, are making nematodes to grow out of control these nematodes then parasite the ear of frogs, and the animal become deaf, a deaf frog can not hear a predator coming of finding a mate so the frogs population is coming down real fast here in the States. I wonder if somebody is keeping track of the frog population in your area or country. Or if this is a problem in another places?
It's an interesting food chain thing to consider. Let's suppose Raccoons eat Frogs - I'm not sure - but suppose. Apparently, this would mean that the Raccoons could eat all the Frogs they need, therefor the Raccoons are well fed. And it all fits the natural food chain. Looking at it that way, it' sounds like it would be a good thing. Sounds too good that way, doesn't it.
I read the article in Science, I tried to find it again for you I have a hundred of those magazines, but if I find it I give you more details.