features linking theropod dinosaurs to birds are a furcula, air-filled bones, brooding of the eggs, and feathers.
Theropoda /θɨˈrɒpɵdə/ , from Greek meaning beast feet) are a group of saurischian dinosaurs. Theropods were ancestrally carnivorous, although a number of theropod groups evolved herbivory, omnivory, piscivory, and insectivory. Four very small eggs (18 mm by 11 mm) have been found from the Cretaceous which either represent a primitive bird whose eggs retained features found in the eggs of dinosaurs or the eggs of a theropod dinosaur closely related to birds (Grellet-Tinner, 2006). On July 31, 2014, scientists reported details of the evolution of birds from other theropod dinosaurs. Among the features linking theropod dinosaurs to birds are a furcula (wishbone), air-filled bones, brooding of the eggs, and (in coelurosaurs, at least) feathers. The first confirmed non-carnivorous theropods found were the therizinosaurs, originally known as segnosaurs. First thought to be prosauropods, these enigmatic dinosaurs were later proven to be highly specialized, herbivorous theropods. The theropod (meaning beast-footed) dinosaurs are a diverse group of bipedal saurischian dinosaurs. They include the largest terrestrial carnivores ever to have made the earth tremble. What most people think of as theropods (e.g., T. rex, Deinonychus) are extinct today, but recent studies have conclusively shown that birds are actually the descendants of small nonflying theropods. Among the features linking theropod dinosaurs to birds are the three-toed foot, a furcula (wishbone), air-filled bones, brooding of the eggs, and (in some cases) feathers. The smallest non-avian full adult specimen is the Anchiornis, which weighed only 3.38 ounces, and was less than 1 foot long. In the Jurassic, birds evolved from small specialized coelurosaurian theropods, and are today represented by 9,900 living species. Among the features linking theropod dinosaurs to birds are the three-toed foot, a furcula (wishbone), air-filled bones, brooding of the eggs, and (in some cases) feathers. Theropoda (theropod /ˈθɛrəpɒd/; suborder name Theropoda /θɨˈrɒpɵdə/, from Greek meaning beast feet) is both a suborder of bipedal saurischian dinosaurs, and a clade consisting of that suborder and its descendants (including modern birds).
https://en.wikipedia.org/wiki/Theropoda http://bio.sunyorange.edu/updated2/pl%20new/55%20bird%20ancestors.htm https://en.wikipedia.org/wiki/Theropoda http://dinopedia.wikia.com/wiki/Theropoda http://www.ucmp.berkeley.edu/diapsids/saurischia/theropoda.html http://dinopedia.wikia.com/wiki/Theropoda http://schools-wikipedia.org/wp/t/Theropoda.htm http://dinopedia.wikia.com/wiki/Theropoda
what features are found in theropods