![This red-crested tree rat (Santamartamys rufodorsalis), a guinea-pig-sized rodent not seen since 1898 and thought perhaps to be extinct, is seen at the El Dorado Nature Reserve in Colombia, South America on This red-crested tree rat (Santamartamys rufodorsalis), a guinea-pig-sized rodent not seen since 1898 and thought perhaps to be extinct, is seen at the El Dorado Nature Reserve in Colombia, South America on](https://c8.alamy.com/comp/W0MJ1R/this-red-crested-tree-rat-santamartamys-rufodorsalis-a-guinea-pig-sized-rodent-not-seen-since-1898-and-thought-perhaps-to-be-extinct-is-seen-at-the-el-dorado-nature-reserve-in-colombia-south-america-on-may-4-2011-upilizzie-nobleproaves-W0MJ1R.jpg)
This red-crested tree rat (Santamartamys rufodorsalis), a guinea-pig-sized rodent not seen since 1898 and thought perhaps to be extinct, is seen at the El Dorado Nature Reserve in Colombia, South America on
![Prof. Katie Hinde on Twitter: "UP NEXT: 8-seed Red-crested Tree Rat vs. 9-seed Red & White Giant Flying Squirrel #2021MMM https://t.co/tnydFRPqIq" / Twitter Prof. Katie Hinde on Twitter: "UP NEXT: 8-seed Red-crested Tree Rat vs. 9-seed Red & White Giant Flying Squirrel #2021MMM https://t.co/tnydFRPqIq" / Twitter](https://pbs.twimg.com/media/EwKjH9eUUAAOpWG.png)
Prof. Katie Hinde on Twitter: "UP NEXT: 8-seed Red-crested Tree Rat vs. 9-seed Red & White Giant Flying Squirrel #2021MMM https://t.co/tnydFRPqIq" / Twitter
![A Beautiful Photograph of the Red Crested Tree Rat Stock Illustration - Illustration of tropical, adorable: 276263094 A Beautiful Photograph of the Red Crested Tree Rat Stock Illustration - Illustration of tropical, adorable: 276263094](https://thumbs.dreamstime.com/z/red-crested-tree-rat-small-rodent-species-found-tropical-rainforests-south-america-has-reddish-brown-fur-long-276263094.jpg)
A Beautiful Photograph of the Red Crested Tree Rat Stock Illustration - Illustration of tropical, adorable: 276263094
![Spectacular Mammal Rediscovered after 113 Years! - Fundación ProAves - por la conservación en el país de las aves Spectacular Mammal Rediscovered after 113 Years! - Fundación ProAves - por la conservación en el país de las aves](https://www.proaves.org/wp-content/uploads/IMG/png/Santamartamys_rufodorsalis2.png)