Panther, Tampa's Lowry Park Zoo

Photograph by Joel Sartore

Rescued as a kitten after being abandoned in the wild by its mother in 2007, Calusa, nicknamed "Lucy," is one of no more than 165 surviving Florida panthers.

Sartore photographed Lucy as part of his Photo Ark project, through which he is documenting thousands of rare species. "Half of all the species on Earth could be headed irreversibly toward extinction by 2100. Not if I can help it," Sartore says. "That's the idea behind the Photo Ark: getting the public to look these creatures in the eye, then care enough to save them while there's still time."

Rath Yatra Festival, Bangladesh

Photograph by Md Rafayat Haque Khan

Enthusiastic devotees take part in a colorful Rath Yatra procession in the Sylhet region of Bangladesh. Also known as the Festival of Chariots, the Hindu celebration honors a mid-summer chariot journey made by Lord Jagannath.

Photographing in his hometown, Your Shot contributor Md Rafayat Haque Khan wanted to capture the essence of the festival in a single frame. To get this shot, Khan went to the top of a three-story building as devotees pulling raths, or holy carts, arrived in time for an afternoon prayer. "I got a vantage point for capturing this awesome moment," Khan says. "It seemed to me I was seeing a wave of devoted souls coming row by row to get blessings from the Jagannath."