A new species of non-avian dinosaur with a streamlined body similar to those of modern diving birds, such as penguins and auks, is described in a study published in Communications Biology. The findings represent the first case of a non-avian theropod—a type of carnivorous dinosaur that walked on two legs—to have a streamlined body.
source https://www.lifetechnology.com/blogs/life-technology-science-news/new-toothy-diving-dinosaur-discovered