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Nematodes may be among the simplest animals, but scientists can't get enough of the microscopic roundworms. They have mapped the entire genome of C. elegans, the "lab rat" of nematodes, and have characterized nearly every aspect of its biology, with a particular focus on neurons. For years, it was assumed other nematodes' neurons were similar...

After wolves were reintroduced to Yellowstone National Park in the mid-1990s, some scientists thought the large predator reestablished a 'landscape of fear' that caused elk, the wolf's main prey, to avoid risky places where wolves killed them. This fueled the emerging idea that predators affect prey populations and ecosystems not only by eating prey animals,...

Tiny freshwater fish have a view of the world that blows Google Street View out of the water -- using different parts of their eyes to deliver optimum uses of colour, black-and-white and ultraviolet.

Deep in the night in muddy African rivers, a fish uses electrical charges to sense the world around it and communicate with other members of its species. Signaling in electrical spurts that last only a few tenths of a thousandth of a second allows the fish to navigate without letting predators know it is there....