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Daddy day-care: dinosaur fathers guarded the eggs



http://www.msnbc.msn.com/id/28302741/

updated 59 minutes ago
WASHINGTON - By Will Dunham

You can call it dino daddy day-care.

Scientists who examined the fossilized remains of three types of
medium-sized dinosaurs found with large clutches of eggs have concluded that
the males rather than the females seem to have guarded the nests and brooded
the eggs.

Writing on Thursday in the journal Science, they said this behavior is seen
in certain existing species of birds. Scientists believe birds evolved from
small, feathered predatory dinosaurs more than 150 million years ago.

The three types of dinosaurs, Troodon, Oviraptor and Citipati, lived roughly
75 million years ago and were theropods -- the primarily meat-eating group
that also includes monstrous beasts like Tyrannosaurus rex and
Giganotosaurus.

"There are a lot of characteristics that we once thought were unique to
birds that are turning out not to be -- that they first arose in their
theropod ancestors," Montana State University paleontologist Frankie
Jackson, one of the researchers, said in a telephone interview.


The scientists said the findings suggest...     





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