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Here we quantify substantial interspecific variation in eye shape and colouration across 77 primate species representing all extant genera of anthropoid primates. We reassess a series of hypotheses aiming to explain ocular variation in horizontal elongation and in colouration across species. Heavier body weight and terrestrial locomotion are associated with elongated eye outlines. Species living closer to the equator present more pigmented conjunctivae, suggesting photoprotective functions. Irises become bluer in species living further away from the equator, adding to existing literature supporting a circadian clock function for bluer irises. \nThese results shift the current focus from communicative, to ecological factors in driving variation in external eye appearance in anthropoid primates. They also highlight the possibility that similar ecological factors contributed to selection for blue eyes in ancestral human populations living in northern latitudes"},"dsDescriptionDate":{"typeName":"dsDescriptionDate","multiple":false,"typeClass":"primitive","value":"2026"}}]},{"typeName":"subject","multiple":true,"typeClass":"controlledVocabulary","value":["Earth and Environmental Sciences","Medicine, Health and Life Sciences"]},{"typeName":"publication","multiple":true,"typeClass":"compound","value":[{"publicationCitation":{"typeName":"publicationCitation","multiple":false,"typeClass":"primitive","value":"Perea-García, J. O., Ramarajan, K., Kret, M. E., Hobaiter, C., & Monteiro, A. (2022). Ecological factors are likely drivers of eye shape and colour pattern variations across anthropoid primates. Scientific Reports, 12(1), 17240. https://doi.org/10.1038/s41598-022-20900-6"},"publicationIDType":{"typeName":"publicationIDType","multiple":false,"typeClass":"controlledVocabulary","value":"doi"},"publicationIDNumber":{"typeName":"publicationIDNumber","multiple":false,"typeClass":"primitive","value":"/10.1038/s41598-022-20900-6"},"publicationURL":{"typeName":"publicationURL","multiple":false,"typeClass":"primitive","value":"https://www.nature.com/articles/s41598-022-20900-6"}}]},{"typeName":"notesText","multiple":false,"typeClass":"primitive","value":"03/03/2026 -This is a snapshot of the dataset on the Open Science Framework: https://osf.io/ms4ve/overview"},{"typeName":"language","multiple":true,"typeClass":"controlledVocabulary","value":["English"]},{"typeName":"depositor","multiple":false,"typeClass":"primitive","value":"Hoffmann, Franca; Mink, Jaap-Willem; Plomp, Willemijn"},{"typeName":"dateOfDeposit","multiple":false,"typeClass":"primitive","value":"2026-04-10"}]},"dansDataVaultMetadata":{"displayName":"Data Vault Metadata","name":"dansDataVaultMetadata","fields":[{"typeName":"dansDataversePid","multiple":false,"typeClass":"primitive","value":"doi:10.34894/8CGWUU"},{"typeName":"dansDataversePidVersion","multiple":false,"typeClass":"primitive","value":"1.0"},{"typeName":"dansBagId","multiple":false,"typeClass":"primitive","value":"urn:uuid:5af2c007-a438-42df-b482-7a6db30e9864"},{"typeName":"dansNbn","multiple":false,"typeClass":"primitive","value":"urn:nbn:nl:ui:13-72663d2f-7ce2-491e-b47e-ca3e8985500f"}]}},"files":[{"label":"1. 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