Abstract
A natural braincase cast of the Late Cretaceous dinosaur Ceratonykus oculatus (Parvicursoridae, Alvarezsauria) is described. The brain of this species is constructed based on the reptilian archetype without dorsoventral curvatures. In the midbrain, the optic lobes are displaced ventrolaterally and the acoustic lobes are very large and adjoin rostrally the telencephalon. The cerebellum is bifid and transversely expanded. The complex of the metencephalon and myelencephalon narrows laterally. Some of the characters listed are not typical of the majority of extant and extinct sauropsids. It is concluded that alvarezsaurians had good eyesight and keen hearing and their ancestors were characterized by elements of an arboreal mode of life.
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