In mammals, which give birth to more or less dependent offspring, parturition usually takes place during the animals' resting period and in a secure environment. We report here the first direct and documented observation of a daytime birth of a wild baby crested black macaque, Macaca nigra, in the Tangkoko Batuangus Nature Reserve, North Sulawesi, Indonesia. We further consider the parturition time as a female reproductive strategy in a broader evolutionary framework.