Final answer:
The claim that hadrosaurids are the best-known dinosaur group is false; other groups such as theropods are well-studied, especially due to their evolutionary connection to modern birds.
Step-by-step explanation:
The statement that hadrosaurids are probably more well-known than any other single group of dinosaurs is false.
Although hadrosaurids, known colloquially as duck-billed dinosaurs, are one of the more well-documented dinosaur groups due to their widespread remains and the discovery of several complete fossils.
Other groups such as theropods—which include the famous Tyrannosaurus rex and ancestors of modern birds—have been extensively studied as well and may be comparably or even more familiar to both scientists and the public.
The theropods are particularly significant in the study of dinosaur evolution due to their connection to birds, which are considered living dinosaurs and the only surviving lineage of the theropod group.
Evidence of bird-like features such as feathers and wishbones in theropod fossils strongly supports the evolutionary link between these dinosaurs and modern avian species.