Nest of juveniles provides evidence of family structure among dinosaurs

@article{Horner1979NestOJ,
  title={Nest of juveniles provides evidence of family structure among dinosaurs},
  author={John R. Horner and Robert Makela},
  journal={Nature},
  year={1979},
  volume={282},
  pages={296-298}
}
One of the greatest mysteries associated with dinosaurs is the rarity of juveniles. With the notable exception of the Djadochta and Iren Dabasu Formations of Mongolia and the Two Medicine Formation of Montana, skeletal elements of very young dinosaurs are exceedingly uncommon1–3, leaving a gap in the understanding of dinosaur social structures1,3,4. The most popular explanation, based chiefly on negative evidence, is that the eggs and young were ‘kept’ in the uplands where they were rarely… 

Evidence for juvenile groups in the ornithopod dinosaur Tenontosaurus tilletti Ostrom

These recent discoveries have generated a number of hypotheses on the reproductive behavior of dinosaurs relating to the extent of parental care, fidelity in nesting sites, and the aggregation of juveniles into groups.

Evidence of colonial nesting and ‘site fidelity’ among ornithischian dinosaurs

Recent discoveries in the late Cretaceous (Campanian) Two Medicine Formation of western Montana indicate that some dinosaur species, like some modern species of birds and crocodiles, nested in

AN AGGREGATION OF JUVENILE YOUNGINA FROM THE BEAUFORT GROUP, KAROO BASIN, SOUTH AFRICA

An assemblage of five fully-articulated juvenile skeletons of Youngina has been recovered from the Late Permian strata of the south-western Karoo Basin. These 12-cm-long skeletons are not only the

A nesting dinosaur

The specimen described here is the first preserved well enough to determine its precise relationship with the nest, and provides the strongest evidence yet for the presence of avian brooding behaviour in non-avian dinosaurs.

Juvenile-Only Clusters and Behaviour of the Early Cretaceous Dinosaur Psittacosaurus

It has hitherto been hard to prove that any association of juvenile dinosaurs represents original behaviour rather than sedimentary accumulation, and it has been hard also to determine the ages of

First trace and body fossil evidence of a burrowing, denning dinosaur

Burrowing habits expand the known range of nonavian dinosaur behaviours and suggest that the cursorial ancestry of dinosaurs did not fully preclude the evolution of different functional regimes, such as fossoriality.

A nesting trace with eggs for the Cretaceous theropod dinosaur Troodon formosus.

ABSTRACT An unusual trace containing eggs of the 50 kg-plus theropod dinosaur, Troodon formosus, represents one of the best preserved dinosaur nests. This unique specimen (MOR 963) represents the

Evidence of Gregariousness in Rebbachisaurids (Dinosauria, Sauropoda, Diplodocoidea) from the Early Cretaceous of Neuquén (Rayoso Formation), Patagonia, Argentina

ABSTRACT For the first time an association of adult and juvenile rebbachisaurid sauropods is described. The material comes from the Early Cretaceous locality of Agrio del Medio (Neuquén,

Feeding height stratification among the herbivorous dinosaurs from the Dinosaur Park Formation (upper Campanian) of Alberta, Canada

No good evidence is found that feeding height stratification played an important role in facilitating niche partitioning among the herbivorous dinosaurs of Laramidia, and consideration of other feeding height proxies may help to alleviate problems of underdetermination.

The ‘duck-billed’ dinosaurs of Careless Creek (Upper Cretaceous of Montana, USA), with comments on hadrosaurid ontogeny

The juvenile material from the Careless Creek Quarry exemplifies several patterns of mandibular and appendicular osteological variation previously observed in other hadrosaurids, but it also shows some departures from the common trends, supporting the fact that not all skeletal growth changes can be generalized to all hadrosurids.
...

References

SHOWING 1-7 OF 7 REFERENCES

EVOLUTION OF THE HORNED DINOSAURS

The horned dinosaurs or ceratopsians are of particular interest to the student of evolution because they were the last of the dinosaurs, appearing at a late stage in the Mesozoic-Era and going through the entire range of their phylogenetic history in a relatively short space of geologic tiiye.

Taxonomic Implications of Relative growth in Lambeosaurine Hadrosaurs

A fauna of 3 genera and 12 species of lambeosaurine hadrosaurs (crested duck-billed dinosaurs) from the Oldman Formation of southern Alberta is examined, finding niche differentiation by size among closely related species of large reptiles does not seem to be a feasible strategy.

Perhaps juvenile dinosaurs were always scarce

The age composition of some turtle populations shows that some reptile species consist of very few juveniles and many adults which mature early, live to great age, and have a long reproductive life.

On the development of metaphytes and metazoans

Evolutionary transition in plant life cycles led to late Precambrian emergence of metaphytes, eukaryotic sexuality

The year of the dinosaur