How Many Legs?

So maybe this has always happened in the grand scheme of things, or has it? In the last few years I have seen more and more pictures on tv showing genetic oddities in the animal world. Seems that more and more often, I see these. Calves with two heads are a freguent picture as are pictures of dogs, cats, chickens and other animals with extra legs. Then I've also seen pictures of snakes and lizards with two heads. This morning I saw a picture of a frog with eight legs. Not too long ago there was a news item which said that changes in frogs were an indication of some possible things wrong with our planet. Frogs and lizards are supposed to be more sensitive to changes in the environment than other species. Is that why frogs have been changing their sex or do they just have gender issues? I wonder if this has been going on for a long time and we just didn't pay attention? Or is this a media attempt to alarm us? Many people are trying to increase our awareness of the changes on our planet. From the global warming issues to changes in the different creatures sharing the planet with us, should we worry? Is the media making much ado about nothing? Or is there something more sinister going on? Let's see today, the local tv news showed a lamb with 5 legs and a frog with eight. Go figure.