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Tiny, swift, and iridescent, hummingbirds dart around flowers and feeders, sipping nectar with their seemingly delicate beaks.
But new research shows that these beaks actually double as deft, dagger-...
A New Leptoceratopsid (Ornithischia: Ceratopsia) from the Upper Cretaceous of Shandong, China and Its Implications for Neoceratopsian Evolution
A New Leptoceratopsid Neoceratopsian Evolution
2014/3/26
The leptoceratopsids are a group of small, quadrupedal horned
dinosaurs. They normally have a total body length of about two
meters, and are thus much smaller than the contemporary
ceratopsids [1]....
The asymmetry of the carpal joint and the evolution of wing folding in maniraptoran theropod dinosaurs
Laboratory of Evolutionary Systematics of Vertebrates Institute of Vertebrate Palaeontology
2014/3/26
In extant birds, the hand is permanently abducted towards the ulna, and the wrist joint can bend exten-
sively in this direction to fold the wing when not in use. Anatomically, this asymmetric mobili...