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Yes they are.
The new phylogenetic classification system seeks out to classify by relationship and not solely charecteristics as the old classification system.
This means, if birds are more closely related to other dinosaurs, than all dinosaurs are to eachother, they will necessarily be dinosaurs themselves. Birds are more closely related to theropods, than they are to sauropods, and as such we can conclude them to be dinosaurs.
Source:
PhyloCode
There's some guesswork here, but ALL birds probably evolved from small feathered dinosaurs who were cousins to the Velociraptors. We don't know which was the lineal ancestor of birds. Small, delicate skeletons don't supply the best fossils, but there's still hope that one may turn up.
If you're referring to Ducky from "The Land Before Time" series, she is a Saurolophus.
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What would win a dinosaur or an elephant?
depends what kind of dinosaur it is but probably the dinosaur
What kind of dinosaur was rhamphorhynchus?
Rhamphorhynchus was a pterosaur, not a dinosaur.
What kind of dinosaur that live the Philippines?
A Dinosaur Bird
What kind of fossils are dinosaur tracks?
Dinosaur tracks are trace fossils
What kind of dinosaurs are little foot and ducky and Petrie and spike and cera and chomper?
Littlefoot, Cera, Ducky, Petrie, and Spike originally found Chomper as an egg, mistaking it for some nest.
What kind of dinosaur is Riff?
Corythosaurus
Plateosour what kind of animal is it?
it is a dinosaur
What does stegasaurus mean?
Its a kind of dinosaur.
What kind of animal was stegosaurus?
A dinosaur
What kind of dinosaur was the Maiasaura?
The Maiasaura.
Were oviraptors a kind of dinosaur?
Yes, they were.
What does kentrosaurus mean?
it is a kind of dinosaur
