We witness evolution every day we get an infection or the flu -- microorganisms change constantly, which gives their offspring the ability to defeat antibiotics and immune system defenses. Doctors have known this for decades now. But what would you say if lizards from one species change into another, different species altogether?
This is exactly what has happened. At Pharyngula, a nice story about thirty years of evolution shows what Darwin might have seen:
Here's the story: in 1971, scientists started an experiment. They took 5 male lizards and 5 female lizards of the species Podarcis sicula from a tiny Adriatic island called Pod Kopiste, 0.09km2, and they placed them on an even tinier island, Pod Mrcaru, 0.03km2, which was also inhabited by another lizard species, Podarcis melisellensis. Then a war broke out, the Croatian War of Independence, which went on and on and meant the little islands were completely neglected for 36 years, and nature took its course. When scientists finally returned to the island and looked around, they discovered that something very interesting had happened.