![Gelada Baboon, Theropithecus gelada, Simien Mountains National Park, Ethiopia, male with red chest, bleeding heart, vunerable, endangered Stock Photo - Alamy Gelada Baboon, Theropithecus gelada, Simien Mountains National Park, Ethiopia, male with red chest, bleeding heart, vunerable, endangered Stock Photo - Alamy](https://c8.alamy.com/comp/JY8NAM/gelada-baboon-theropithecus-gelada-simien-mountains-national-park-JY8NAM.jpg)
Gelada Baboon, Theropithecus gelada, Simien Mountains National Park, Ethiopia, male with red chest, bleeding heart, vunerable, endangered Stock Photo - Alamy
![ifaw on Twitter: "Found in the mountains of Ethiopia, the gelada monkey is the last living species of ancient grazing primates. Geladas live off a diet of 90% grass and have iconic ifaw on Twitter: "Found in the mountains of Ethiopia, the gelada monkey is the last living species of ancient grazing primates. Geladas live off a diet of 90% grass and have iconic](https://pbs.twimg.com/media/Dfl_MOPWsAApIGE.jpg)
ifaw on Twitter: "Found in the mountains of Ethiopia, the gelada monkey is the last living species of ancient grazing primates. Geladas live off a diet of 90% grass and have iconic
![American Museum of Natural History on Twitter: "Meet the gelada baboon! It's also known as the bleeding-heart baboon for the hairless red skin on its chest. Despite its common name, it's not American Museum of Natural History on Twitter: "Meet the gelada baboon! It's also known as the bleeding-heart baboon for the hairless red skin on its chest. Despite its common name, it's not](https://pbs.twimg.com/media/Dr45XwKXQAI7ZbA.jpg:large)
American Museum of Natural History on Twitter: "Meet the gelada baboon! It's also known as the bleeding-heart baboon for the hairless red skin on its chest. Despite its common name, it's not
![MorphoLab Barcelona on Twitter: "#Didyouknow The #gelada females have developed a naked patch on the chest that informs about their hormonal status (if they are on heat or not). When they come MorphoLab Barcelona on Twitter: "#Didyouknow The #gelada females have developed a naked patch on the chest that informs about their hormonal status (if they are on heat or not). When they come](https://pbs.twimg.com/media/D5jXxfoW0AARCtn.jpg)
MorphoLab Barcelona on Twitter: "#Didyouknow The #gelada females have developed a naked patch on the chest that informs about their hormonal status (if they are on heat or not). When they come
![Stock photo of Gelada baboon (Theropithecus gelada) female with chest swelling caused by.... Available for sale on www.naturepl.com Stock photo of Gelada baboon (Theropithecus gelada) female with chest swelling caused by.... Available for sale on www.naturepl.com](https://www.naturepl.com/cache/pcache2/01247214.jpg)
Stock photo of Gelada baboon (Theropithecus gelada) female with chest swelling caused by.... Available for sale on www.naturepl.com
![Field Notes from an Evolutionary Psychologist: Sisterhood is Powerful: Lessons from Gelada & Hamadryas Baboons Field Notes from an Evolutionary Psychologist: Sisterhood is Powerful: Lessons from Gelada & Hamadryas Baboons](http://1.bp.blogspot.com/_pRrgVOeyl_Q/SR3rtW2oXEI/AAAAAAAABfg/NhyTQ4whWgY/s280/GeladaBaboonSwelling%28M%26F%29.jpg)
Field Notes from an Evolutionary Psychologist: Sisterhood is Powerful: Lessons from Gelada & Hamadryas Baboons
![It may look like this gelada baboon has acne, but these swellings on her chest are actually a sign of sexual receptivity. : r/natureismetal It may look like this gelada baboon has acne, but these swellings on her chest are actually a sign of sexual receptivity. : r/natureismetal](https://i.redd.it/v6316jpvb6g71.jpg)
It may look like this gelada baboon has acne, but these swellings on her chest are actually a sign of sexual receptivity. : r/natureismetal
![The gelada looks like it's been skinned at the chest and throat, and is one of the last known grass-eating primates. The exposed skin c… | Primates, Baboon, Animals The gelada looks like it's been skinned at the chest and throat, and is one of the last known grass-eating primates. The exposed skin c… | Primates, Baboon, Animals](https://i.pinimg.com/736x/d4/58/b3/d458b32b8a42606ff2c1aa10d106d0e7.jpg)