Denobulans had prominent facial ridges running down either side of the forehead to the cheeks, an enlarged brow ridge under a high receded hairline, a vertical crevice in the center of the forehead, and a ridged chin. They also had ridges on their back, along the spine. Denobulans also had very long tongues, wide smiles and the ability to enlarge their faces. Denobulans females had very potent pheromones that the males could sense, and they released them when they were romantically interested in someone or when looking to concieve a child.
Denobulans were typically polygamous, where a man typically had three wives, who each had three husbands. On their homeworld, Denobula, the twelve billion Denobulan inhabitants all shared one continent, resulting in living space being at a premium and Denobulan culture having come to embrace close, communal lifestyles, although this habitation arrangement was due to choice rather than necessity. They are a well adjusted and peaceful member of the Interstellar community though have fought wars in their past.