Human Journey

National Geographic Photo Ark Spotlight: Key Largo Woodrat

World Day For Animals In Laboratories (also known as World Lab Animal Day) is observed every year on April 24, today. It is an opportunity to think about the animals that spend and sacrifice their lives in pursuit of science, often with the goal of finding safe medical treatments for humans.

One animal that comes readily to mind when you think of the term “laboratory animal” is the venerable rat, a rodent that is as ubiquitous as it is reviled. Not all rats are “guinea pigs” for the lab, however. Some are highly prized for their rarity, such as Florida’s Key Largo woodrat.

The Key Largo woodrat (Neotoma floridana smalli) is one of the most endangered rodents on Earth. It can be found only in tropical hammocks in Key Largo, Florida, according to the Florida Fish & Wildlife Conservation Commission (FWC).

The midsize rodent (12-16 inches long) is besieged by a wide range of threats.  Citing the U.S. Fish & Wildlife Service, FWC says development on Key Largo has caused the thinning and destruction of vegetation in the hammocks. “Habitat fragmentation threatens the species by limiting gene flow and increasing risk from other threats.  The limited range makes the Key Largo woodrat vulnerable to storms and fires.  Sea level rise also threatens the species as their habitat would be inundated with ocean water.  Other threats include increased predation by feral cats and competition from black rats.”

Known for its habit of building large stick houses, Key Largo woodrats depend heavily on the natural vegetation of the tropical hardwood hammocks to obtain material for constructing these houses, FWS says. “Although large portions of the remaining habitat are now in protection, there has been such a reduction in its total range and habitat that the future of this species remains in an endangered condition.” (Download a FWS PDF about the woodrat).

Related Content

In the Florida Keys, cat lovers smell a rat (Miami Herald)

Good News for the Endangered Woodrat (Jane Goodall’s Good for All News)

Click the logo above to find out more about the National Geographic Photo Ark project, and what you can do to help lynxes and other species survive for future generations.
Click the logo above to find out more about the National Geographic Photo Ark project, and what you can do to help species survive for future generations.

The National Geographic Photo Ark is a multi-year project to photograph all species in captivity. The Key Largo woodrat is among them. To learn more about the Photo Ark, visit,

Follow the Photo Ark photographer Joel Sartore and the National Geographic Photo Ark on InstagramTwitter, and Facebook, and add your voice using #SaveTogether.

Forty years in U.S., UK, and South African media gives David Braun global perspective and experience across multiple storytelling platforms. His coverage of science, nature, politics, and technology has been published/broadcast by the BBC, CNN, NPR, AP, UPI, National Geographic, TechWeb, De Telegraaf, Travel World, and Argus South African Newspapers. He has published two books and won several journalism awards. He has 120,000 followers on social media. David Braun edits the National Geographic Society blog, hosting a global discussion on issues resonating with the Society's mission and initiatives. He also directs the Society side of the Fulbright-National Geographic Digital Storytelling Fellowship, awarded to Americans seeking the opportunity to spend nine months abroad, engaging local communities and sharing stories from the field with a global audience. Follow David on Facebook  Twitter  LinkedIn

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