Dinosaurs are related to eagles.
Dinosaur . The fossil record , however , indicates that birds , which are now termed `` avian dinosaurs , '' are the modern descendants of feathered dinosaurs , having evolved from theropod ancestors during the Jurassic Period . 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 '' . Eagle is a common name for many large birds of prey of the family Accipitridae ; it belongs to several groups of genera that are not necessarily closely related to each other .