Dinosaurs are related to birds.
Dinosaur . As such , birds were the only dinosaur lineage to survive the mass extinction event . Throughout the remainder of this article , the term `` dinosaur '' is sometimes used generically to refer to the combined group of avian dinosaurs ( birds ) and non-avian dinosaurs ; at other times it is used to refer to the non-avian dinosaurs specifically , while the avian dinosaurs are sometimes simply referred to as `` birds '' . Dinosaurs are represented on every continent by both extant species ( birds ) and fossil remains .