For although we tend to think of evolutionary change as being something that only takes place over the course of millions of years, it isn't. It's going on here, now, all around us. So, this week, I thought I'd round up some examples of recent evolutionary change in nature. (What do I mean by recent? Within the last 40 years.)

I'm not intending to be comprehensive - that would take a book or two. Instead, I want to sketch a few examples of natural selection that have caught my fancy, and through them consider different aspects of evolutionary change, and what it takes to show it.