2026-04-05T12:42:18Zhttps://recercat.cat/oai/request

oai:recercat.cat:2072/4269922024-10-31T01:46:17Zcom_2072_98col_2072_378192

00925njm 22002777a 4500 dc Mayor Aparicio, Pedro Ginés author Mamani, Javier author Montes Aliaga, Daniel author González-Crespo, Carlos author Sebastián, M. A. author Bowler, Mark author 2015 In social species, such as primates, facial appearances transmit a variety of social signals. Although it is suggested that the intense red colour of the face of the bald uakari monkey might be an indicator of health, this hypothesis still has not been verified. This study describes the histological structure of the skin of the face in the bald uakari, compared with other non-red neotropical primates, to better understand the maintenance of its colour. The facial skin of the bald uakari monkey is characterized by a thinner epidermis, absence of melanin pigments and a high density of vascular capillaries that spread below the epidermis. These vascular capillaries are larger and more tortuous than in other neotropical primates. The skin of the face of the bald uakari monkey allows a direct external assessment of haematological status, suggesting that the colour of the face would be an honest indicator of health, but could also signal sexual or behavioural states. Uakari Cacajao calvus Face Coloration Health indicator Proximate causes of the red face of the bald uakari monkey (Cacajao calvus)