Some 150 million years ago, Europe was tropical — and mostly underwater. The entire continent was closer to the equator than it is today, and what is now Germany and its neighbouring countries was ...

Dark-eyed junco songbirds have been serenading the University of California, Los Angeles campus for decades as they forage for food. The species from the sparrow family is not usually found in cities.

The molecular clock theory posits that genetic changes happen steadily and gradually, offering a reliable means for peering into the past and theorizing when complex life first emerged. However, there ...