Who Knew Facts - The magnificent red-crested tree rat (Santamartamys rufodorsalis), stayed for almost two hours while two research volunteers took the first photos ever of a creature the world thought would
![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/W0MJ1T/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-W0MJ1T.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
![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)