Evidence that birds evolved from these early dinosaurs

lovethee History

SUPERORDER HERRERAVIA new

 

At first glance these are very like staurikosaurs, including their four-toed feet. Yet some unexpectedly avian-like features appear in these dinosaurs, including a long-strap scapular blade, a birdlike hip joint, and a backward-pointing pubis. The humerus of Frenguelhscurus also has bird-style shoulder and elbow joints (Realistic dinosaur costume). This implies that the arm could fold more tightly than in most dinosaurs, although not as well as in protobird theropods and birds. Even early theropods lack these features. And if the “Protoavis” remains (Walking dinosaur costume) belong in this group as I believe, then they are either confirmation that the herrerasaurs were remarkable imitators of birds, or evidence that birds evolved from these early dinosaurs.

 

(Animatronic dinosaur)Hefty size was another thing this group developed, especially in great Aliwolio.(animatronic dinosaur for sale)It is not known whether herrerasaurs had ltght armor or not; either is possible. Part of a henerasaur femur came from the middle Stubensandstein of Germany.t Also found in the middle Stubensandstein was a snout that looks like an advanced staurikosaur or henerasaur femur. (The snout has often been assigned to Procompsogmarhus, but in 1981 John Ostrom showed that it does not belong to that taxa.) Since these German herrerasaur remains are middle Norian in age, they may represent the last known paleodinosaurs. Although like all four-toed predatory dinosaurs a short-lived bunch that lasted only five to ten million years, the herrerasaurs conducted some intriguing evolutionary experiments.