Jan 7, 2015
Above, wildebeest cross the Mara River during their annual migration northward from the Serengeti in Tanzania to the Masai Mara in Kenya. An estimated two million animals, mostly wildebeest but also including hundreds of thousands of Thompson's gazelle, zebra, and eland, make this long trek every year during the dry season, as they seek greener pastures; their navigation techniques are not fully understood, but one strategy they seem to follow is to head toward thunder and lightning.
This photo, by Nicole Cambre, took first place in the "Nature" category of National Geographic's 2014 photo competition, which attracted more than 10,000 entrants from 150 different countries.
Below, ice on a window in Tabasalu, Estonia, propagates in a crystal form that the photographer, Maie Kinmann, calls "Dragon." This photo won honorable mention in the "Nature" category.