This article is adapted from Joel Sartore’s new book, Vanishing, published by National Geographic Books. Joel Sartore has been photographing animals for his Photo Ark project for 13 years.

For the first time, scientists have observed the brain throughout the pregnancy timeline, from pre-conception to postpartum.

Hygiene and ritual marked every moment of life for pregnant Aztec women ... story appears in the January/February 2017 issue of National Geographic History magazine. Where do babies come from?

At 22 months, elephant pregnancy is the longest gestation known for any animal. As with savanna elephants, African forest elephants are very slow reproducers, raising new calves only every three ...

This story appears in the August 2016 issue of National Geographic magazine ... down low in the grass to get a closer look at the animal lurching toward me. She’s about four months old, the ...

How much do you know about this critically endangered species and National Geographer Explorer Dian Fossey, the woman who dedicated her life to them? It's been more than 50 years since legendary ...

This story appears in the October 2019 issue of National Geographic magazine. A naked mole rat. That was photographer Joel Sartore’s first model in 2006 when he began making studio portraits of ...

Read this story and more in the June 2018 issue of National Geographic magazine ... proportion of their body mass than any other marine animal, researchers say: In one large population, 90 ...

Most are distinguished by striking colors and bright plumage of yellow, blue, scarlet, and green. These colors distinguish them as some of the world's most dramatic and attractive birds. Males ...

This story appears in the December 2012 issue of National Geographic magazine ... he tried to smuggle in a lion for a Gaza zoo. The animal was improperly sedated, awoke in the tunnel mid-trip ...

The animal's status in the region had been unknown during a quarter-century of violent conflict that halted conservation work. Many feared the worst. But in 2007, National Geographic Explorer-in ...

Editor’s Note: This story accompanies the May 2016 issue of National Geographic magazine, devoted entirely to America’s first national park. Find more at natgeo ...