Blackcap birds that breed in Central Europe in the summer traditionally fly to Spain for the winter. But in the past 50 years, some have started wintering in Britain, lured by seed and suet in bird feeders. Significantly, the birds tend to mate with others that wintered in the same area. Now researchers from Germany and elsewhere have observed that the two blackcap groups differ in wing shape, beak width and feather color—evidence of evolution in action.
Learn more about the blackcap at the Encyclopedia of Life.
The spectacular sights of the cosmos are now as easy to see as the stars above, with the 18 lavishly illustrated lectures of A Visual Guide to the Universe, produced in partnership with the Smithsonian. Orbit Saturn, search for water and life on Mars, and witness an armada of space telescopes uncovering the secrets of the cosmos.
What If?: Serious Scientific Answers to Absurd Hypothetical Questions [Randall Munroe] on Amazon.com. *FREE* shipping on qualifying offers. From the creator of the wildly popular webcomic xkcd, hilarious and informative answers to important questions you probably never thought to ask. Millions of people visit xkcd.com each week to read Randall Munroe's iconic webcomic.