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Male dinosaurs may have been prehistoric babysitters, study shows
Date:12/18/2008

COLLEGE STATION, Dec 18, 2008 Those ferocious Hollywood meat-eating dinosaurs you're used to seeing in the movies very possibly had a much softer side: the males might even have been sort of prehistoric babysitters, according to a far-flung study conducted by a Texas A&M University researcher.

Jason Moore, a post-doctoral researcher in the Department of Geology and Geophysics, and team members from Montana State University, Florida State University and the American Museum of Natural History in New York discovered that some types of male dinosaurs probably cared for and watched over eggs in much the same way that females of other species do. Their work appears in the current issue of Science magazine.

Moore and the research team examined six nests of well-preserved dinosaur eggs, with each nest containing from 22 to 30 eggs found in Montana and Mongolia. Most of the eggs were about 75 million years old.

Numerous clues including the size of the eggs and the internal structure of the adult bones found sitting on the eggs indicate that males, not females, likely watched over the eggs and served in a nanny-like function as the eggs slowly developed.

"The bones we found closest to the eggs don't display characteristics of female dinosaurs," Moore says of the findings.

"Modern birds descended from dinosaurs, so we can use birds as modern representatives of dinosaurs. We have looked at some other modern-day animals for similarities as well, including crocodiles, turtles, snakes and others, and asked the question in each case, 'Which of the parents were taking care of the eggs?' Comparing these modern animals to dinosaurs, the evidence all points to the males as the ones who likely cared for the eggs."

Moore says that studies show that in birds, males participate in parental care about 90 percent of the time, but that loving parental care drastically falls to only 5 percent of mammalian species who do the egg watching.

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Contact: Jason Moore
moore@geo.tamu.edu
979-862-8307
Texas A&M University
Source:Eurekalert

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