哥伦比亚的化石证据表明,一个古老的喇叭猴子祖先在1 360万年前转向了叶类饮食,使得与吃水果的灵长类动物相比,其规模更大,竞争较少。 Fossil evidence from Colombia shows that an ancient howler monkey ancestor shifted to a leaf diet 13.6 million years ago, enabling larger size and less competition with fruit-eating primates.

来自哥伦比亚的Fossil证据表明,Stirtonia Victoriae是一只已灭绝的嚎叫猴子的祖先,在13.3万到1 360万年前转向以叶为主的饮食,使体型大一些,减少了与吃水果的灵长类动物的竞争。 Fossil evidence from Colombia reveals that Stirtonia victoriae, an extinct ancestor of howler monkeys, shifted to a leaf-based diet around 13.3 to 13.6 million years ago, enabling larger body size and reduced competition with fruit-eating primates. Jaw 化石展示了磨牙和深厚而宽阔的下巴结构,建议对坚硬的植物材料进行调整,并可能提前开发与喇叭猴子的叫声相联系的扩大的骨。 Jaw fossils show shearing molars and a deep, wide jaw structure, suggesting adaptations for tough plant material and possibly the early development of the enlarged hyoid bone linked to howler monkeys' loud calls. 这些基于 " 3D " 建模和分析的研究结果突出表明了在米诺内形成原亚马孙雨林期间一个关键的进化转变,揭示了南美洲的原生物种多样化。 The findings, based on 3D modeling and analysis, highlight a key evolutionary transition during the Miocene as the proto-Amazonian rainforest formed, shedding light on primate diversification in South America.