The Pterodaustro slept on water. Pterodaustro is a genus of ctenochasmatid pterodactyloid pterosaur from South America. Its fossil remains dated back to the Early Cretaceous period, about 105 million years ago. The most distinctive characteristic that separates Pterodaustro from other ctenochasmatids is its bristle-like teeth, a feature not seen in any other pterosaur.
