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Where are the egg shells
Bakker (1990) described tightly-packed pods of 6 to 35 individuals which
he interpreted as representing groups of Drinker in burrows, perhaps
drowned by flooding or killed by disease. If Drinker was indeed a
burrower, it would be among the first known for dinosaurs; the only
well-supported published case of a fossorial nonavian dinosaur is the
more recently discovered, distantly related Oryctodromeus. One problem
with Bakker's interpretation was the lack of fossilized egg shell
fragments amongst the individuals which he stated (1992) was a family
group of many juvenile/hatchlings with adults within a nesting burrow
found in Como Bluff, Wyoming.
Supporting the nesting burrow idea, is it possible that a behavior
amongst Drinker, and possibly other small ornithopods, were for the
adults to consume the egg shell fragments after the the babies hatched
as a means to replenish their loss of calicum, and thus no egg shell
fragments to be found in the nest? Egg and egg shell eating is common
amongst the birds ("Dinosaurs") today.
-- Bakker, R.T., Galton, P.M., Siegwarth, J., and Filla, J. (1990). A
new latest Jurassic vertebrate fauna, from the highest levels of the
Morrison Formation at Como Bluff, Wyoming. Part IV. The dinosaurs: A new
Othnielia-like hypsilophodontoid. Hunteria 2(6): 8-14.
-- Bakker, R.T. (1990). A new latest Jurassic vertebrate fauna, from the
highest levels of the Morrison Formation at Como Bluff, Wyoming, with
comments on Morrison biochronology. Part I. Biochronology. Hunteria
-- Bakker, R. T. (1997). "Dinosaur mid-life crisis: the
Jurassic-Cretaceous transition in Wyoming and Colorado". In Lucas, S.G.,
Kirkland, J.I., and Estep, J.W. (eds.). Lower and Middle Cretaceous
Terrestrial Ecosystems. New Mexico Museum of Natural History and Science
Bulletin 14. New Mexico Museum of Natural History and Science. pp.
-- Varricchio, David J.; Martin, Anthony J.; and Katsura, Yoshihiro
(2007). "First trace and body fossil evidence of a burrowing, denning
dinosaur". Proceedings of the Royal Society B: Biological Sciences 274
-- Dinosaur Parents, Dinosaur Young: Uncovering the Mystery of Dinosaur
Families By Kathleen Weidner Zoehfeld; HMH Books for Young Readers
(January 22, 2007) ISBN-10: 0618752447 pgs: 31-32.