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Troodon
Troodon
1860 illustration of the T. formosus holotype tooth
1860 illustration of the T. formosus holotype tooth
Comparison of troodontid teeth; A is the T. formosus holotype
Comparison of troodontid teeth; A is the T. formosus holotype
Teeth from South Dakota assigned to T. formosus, with a US dime coin for scale, Children's Museum of Indianapolis
Teeth from South Dakota assigned to T. formosus, with a US dime coin for scale, Children's Museum of Indianapolis
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Archaeopteryx is often considered the oldest known true bird.
Archaeopteryx is often considered the oldest known true bird.
Anchiornis huxleyi is an important source of information on the early evolution of birds in the Late Jurassic period.
Anchiornis huxleyi is an important source of information on the early evolution of birds in the Late Jurassic period.
Confuciusornis sanctus, a Cretaceous bird from China that lived 125 million years ago, is the oldest known bird to have a beak.
Confuciusornis sanctus, a Cretaceous bird from China that lived 125 million years ago, is the oldest known bird to have a beak.
The range of the house sparrow has expanded dramatically due to human activities.
The range of the house sparrow has expanded dramatically due to human activities.