Giant pandas live rather solitary lives. When it's time to mate, males and females locate one another through scent. Then the female makes chirping noises. Now researchers in China have found the chirps are longer and harsher when the females are most fertile. Males may have an ear for such bleats and time mating attempts accordingly.
Learn more about the giant panda 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.