I think the best recent example of evolution at work is the rise in the tuskless elephant population. A study from 1930 showed the rate of elephants without tusks at only 1 or 2% of the population. Recent studies have it as high as 38%. As a result of rampant poaching, elephants with tusks are having fewer opportunities to mate while those that carry the rare (relatively speaking) tuskless mutation are thriving. The saddest part is that tusks had previously been a very useful mutation, aiding in self-defense, foraging, and sexual display, but now they are more harmful than beneficial.