National Geographic's Photo Ark Documents 18,000 Species in 20-Year Conservation Project

National Geographic photographer Joel Sartore has spent the past 20 years building the Photo Ark, a documentary project that creates studio portraits of animal species from around the world. The archive now contains images of 18,000 species and continues to grow.

Sartore photographs each animal against plain black or white backgrounds, using consistent lighting that presents creatures of all sizes — from insects to large mammals — at similar visual scale. This approach aims to give equal visual weight to every species regardless of its physical size or public recognition.

The project focuses on species in human care, including those at zoos, aquariums, wildlife rehabilitation centers, and private breeding facilities. Many of the photographed animals are endangered or extinct in the wild, making these images among the last visual records of their kind.

Sartore estimates the complete project will require documenting approximately 20,000 species, representing the estimated number of vertebrate and invertebrate species currently maintained in human care worldwide. He continues traveling to facilities across multiple continents to photograph remaining species.

The Photo Ark images have been exhibited internationally, published in multiple books, and featured in National Geographic magazine and digital platforms. Educational materials based on the project are used in schools to teach biodiversity and conservation concepts.

Beyond documentation, the project has contributed to specific conservation outcomes. Several species photographed for the archive have subsequently received increased scientific attention, funding for breeding programs, or policy protections after their images drew public and institutional notice.

Sartore has stated that the project's goal is to create a visual record that inspires action to protect species before they disappear. The archive serves as both a scientific resource and a public engagement tool for biodiversity conservation.

The photographer continues active fieldwork for the project, with recent trips adding hundreds of new species to the collection each year. The National Geographic Society provides ongoing institutional support for the multi-decade effort.