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Archaeopteryx
Archaeopteryx lithographica
is the earliest and most
primitive known bird. In the
1990s, the discovery of a
number of well-preserved
feathered dinosaurs
solidified the link between
dinosaurs and birds. ... > full story
Feathered dinosaurs
The realization that
dinosaurs are closely
related to birds raised the
obvious possibility that
some dinosaurs had feathers.
Fossils of Archaeopteryx
include well-preserved
feathers, but it was not
... > full story
Bird
Birds are bipedal,
warm-blooded, oviparous
vertebrates characterized
primarily by feathers,
forelimbs modified as wings,
and hollow bones. Birds
range in size from the tiny
hummingbirds to the huge
... > full story
Raphinae
The Raphinae are a subfamily
of extinct flightless birds
colloquially called didines
or didine birds. They
inhabited the Mascarene
Islands of Mauritius and
Rodrigues, but became
extinct through hunting by
... > full story
Browse Reference Articles
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Convergent evolution
In evolutionary biology, convergent evolution is the process whereby organisms not closely related (not monophyletic), independently evolve similar traits as a result of having to adapt to similar ... > more -
Velociraptor
Velociraptor is a genus of dromaeosaurid theropod dinosaur that existed approximately 83 to 70 million years ago during the later part of the Cretaceous Period. There is only one universally ... > more -
Cretaceous
The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period, about 146 million years ago (Ma), to the beginning of the Paleocene epoch ... > more -
Trace fossil
Trace fossils are those details preserved in rocks that are indirect evidence of life. While we are most familiar with relatively spectacular fossil hard part remains such as shells and bones, trace ... > more
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