Like other lambeosaurines such as "Parasaurolophus" and "Corythosaurus", "Lambeosaurus" had a distinctive crest on the top of its head. Its nasal cavity ran back through this crest, making it mostly hollow. Many suggestions have been made for the function or functions of the crest. They include housing salt glands, improving the sense of smell, use as a snorkel or air trap, acting as a resonating chamber for making sounds, or being a method for different species or different sexes of the same species to recognize each other. Social functions such as noisemaking and recognition have become the most widely accepted of these hypotheses.