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Red Bald-headed Uacari

Cacajao calvus rubicundus


This is a neotropical monkey with a short non-prehensile tail. They weighs between 2.75 and 3.45 kg, and the length of the body and head in the males averages 45.6 cm and 44 cm in the females. It is characterized by having a red face, lacking hair; the rest of the body has thick grayish fur. They like seeds flowers fruits and sometimes insects, I saw one close to the ground feeding on a fresh Calathea sp leave.


Dense rainforest, Peru and Brazil .


Assessment Information, (FROM THE WEB) Red List Category & Criteria: Vulnerable B1ab(iii,v) ver 3.1 Year Published: 2008 Date Assessed: 2008-06-30 Assessor(s): Rylands, A.B., Boubli, J.-P., Mittermeier R.A. & Veiga, L.M. Reviewer(s): Mittermeier, R.A., Rylands, A.B. (Primate Red List Authority) & Hoffmann, M. (Global Mammal Assessment Team) Justification: Listed as Vulnerable as the range of this subspecies approximates 20,000 km², it survives at fewer than 10 locations, and there is a continuing decline in habitat due especially to logging and agriculture combined with the effects of hunting. Previously published Red List assessments: 2003 – Vulnerable (VU) 2000 – Endangered (EN) 1996 – Endangered (EN)

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Gracias por todos sus comentarios. espero seguir contribuyendo con este grandioso proyecto.

Jim Nelson
Jim Nelson 2 years ago

Well done, Jonathan!

LeanneGardner 2 years ago

Congratulations Jonathon. Your monkey is amazing.

Caleb Steindel
Caleb Steindel 2 years ago

Congratulations! Wonderful spotting!

Sergio Monteiro
Sergio Monteiro 2 years ago

Congratulations, Jonathan.

Greg Shchepanek
Greg Shchepanek 2 years ago

Congratulations Jonathan, fantastic spotting the first photo is brilliant.

Brian38 2 years ago

Congrats Jonathan , incredible spotting and pics!

Thanks a lot,and so glad you like and enjoy this spotting.

Mark Ridgway
Mark Ridgway 2 years ago

Congrats Jonathan. I always feel sorry for bad sunburn.

DanielePralong 2 years ago

Congratulations Jonathan, your Red Bald-headed Uacari is our Spotting of the Day:

"A remarkable, very red face on this Red Bald-headed Uacari (Cacajao calvus rubicundus), our Spotting of the Day! Uacaris (genus Cacajao) have the most intense red facial skin of any primate. The red coloration extends over their whole sparsely haired head, and has an intense scarlet hue due to the underlying blood supply. This red coloration makes the color vision of these monkeys particularly interesting. Color vision is highly variable in New World monkeys, and a substantial body of research has been dedicated to the understanding of the ecological and evolutionary basis of this variation. Recent research suggests that advanced color vision ability in this species may have a role in sexual selection, enabling females to choose high-quality males on the basis of facial coloration as an indicator of good health.
For more information: "



LeanneGardner 2 years ago


SukanyaDatta 2 years ago


Jonathan Sequeira
Spotted by
Jonathan Sequeira

Belén, Loreto, Peru

Spotted on May 18, 2018
Submitted on May 28, 2018

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