They come in all shapes and sizes and abilities - some are dabblers
popping in and out of the surface of a glass lake and others swim with
powerful webbed feet underwater. They fly through the air on short,
stubby wings, traveling in large, energy-efficient formations over
thousands of miles. Some are noisy and gregarious, others shy and
elusive. The producer who brought us "Hummingbirds" is back, where she and NATURE feature another popular, beautiful and fascinating bird - the duck...7pm
It could be NASA's last chance to set wheels down on Mars until the end of the decade. This August a rover named Curiosity touched down inside Mars' Gale Crater, carrying 10 new instruments that will advance the quest for signs that Mars might have once been suitable for life. Who knows what they'll find...NOVA: THE ULTIMATE MARS CHALLENGE...8pm
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