Late Pleistocene humans may have hatched and raised cassowary chicks


Date:
September 27, 2021
Source:
Penn State
Summary:
As early as 18,000 years ago, humans in New Guinea may have
collected cassowary eggs near maturity and then raised the birds
to adulthood, according to an international team of scientists,
who used eggshells to determine the developmental stage of the
ancient embryos/chicks when the eggs cracked.



FULL STORY ==========================================================================
As early as 18,000 years ago, humans in New Guinea may have collected
cassowary eggs near maturity and then raised the birds to adulthood,
according to an international team of scientists, who used eggshells
to determine the developmental stage of the ancient embryos/chicks when
the eggs cracked.


========================================================================== "This behavior that we are seeing is coming thousands of years before domestication of the chicken," said Kristina Douglass, assistant professor
of anthropology and African studies, Penn State. "And this is not some
small fowl, it is a huge, ornery, flightless bird that can eviscerate
you. Most likely the dwarf variety that weighs 20 kilos (44 pounds)."
The researchers report today (Sept. 27) in the Proceedings of the
National Academy of Sciences that "the data presented here may represent
the earliest indication of human management of the breeding of an avian
taxon anywhere in the world, preceding the early domestication of chicken
and geese by several millennia." Cassowaries are not chickens; in fact,
they bear more resemblance to velociraptors than most domesticated
birds. "However, cassowary chicks imprint readily to humans and
are easy to maintain and raise up to adult size," the researchers
report. Imprinting occurs when a newly hatched bird decides that the
first thing it sees is its mother. If that first glance happens to catch
sight of a human, the bird will follow the human anywhere.

According to the researchers, cassowary chicks are still traded as a
commodity in New Guinea.

Importance of eggshells Eggshells are part of the assemblage of many archeological sites, but according to Douglass, archaeologists do not
often study them. The researchers developed a new method to determine
how old a chick embryo was when an egg was harvested.

They reported this work in a recent issue of the Journal of Archaeological Science.



==========================================================================
A captive, modern adult cassowary IMAGE: Andy Mack "I've worked on
eggshells from archaeological sites for many years," said Douglass. "I discovered research on turkey eggshells that showed changes in the
eggshells over the course of development that were an indication of age. I decided this would be a useful approach." The age assignment of the embryos/chicks depends on the 3-dimensional features of the inside of the shell. To develop the method needed to determine the eggs' developmental
age when the shells broke, the researchers used ostrich eggs from a study
done to improve ostrich reproduction. Researchers at the Oudtshoorn
Research Farm, part of the Western Cape Government of South Africa,
harvested three eggs every day of incubation for 42 days for their study
and supplied Douglass and her team with samples from 126 ostrich eggs.

They took four samples from each of these eggs for a total of 504 shell samples, each having a specific age. They created high-resolution, 3D
images of the shell samples. By inspecting the inside of these eggs,
the researcher created a statistical assessment of what the eggs looked
like during stages of incubation. The researchers then tested their
model with modern ostrich and emu eggs of known age.



==========================================================================
The insides of the eggshells change through development because the
developing chicks get calcium from the eggshell. Pits begin to appear
in the middle of development.

"It is time dependent, but a little more complicated,"
said Douglass. "We used a combination of 3D imaging, modeling and
morphological descriptions." The researchers then turned to legacy
shell collections from two sites in New Guinea -- Yuku and Kiowa. They
applied their approach to more than 1,000 fragments of these 18,000-
to 6,000-year-old eggs.

"What we found was that a large majority of the eggshells were harvested
during late stages," said Douglass. "The eggshells look very late; the
pattern is not random. They were either into eating baluts or they are
hatching chicks." A balut is a nearly developed embryo chick usually
boiled and eaten as street food in parts of Asia.

The original archaeologists found no indication of penning for the
cassowaries.

The few cassowary bones found at sites are only those of the meaty
portions - - leg and thigh -- suggesting these were hunted birds,
processed in the wild and only the meatiest parts got hauled home.

"We also looked at burning on the eggshells," said Douglass. "There are
enough samples of late stage eggshells that do not show burning that we
can say they were hatching and not eating them." To successfully hatch
and raise cassowary chicks, the people would need to know where the nests
were, know when the eggs were laid and remove them from the nest just
before hatching. Back in the late Pleistocene, according to Douglass,
humans were purposefully collecting these eggs and this study suggests
people were not just harvesting eggs to eat the contents.

Also working on this project from Penn State were Priyangi Bulathsinhala, assistant teaching professor of statistics; Tim Tighe, assistant research professor, Materials Research Institute; and Andrew L. Mack, grants and contract coordinator, Penn State Altoona.

Others working on the project include Dylan Gaffney, graduate student, University of Cambridge, U.K.; Theresa J. Feo, senior science officer, California Council of Science and Technology; and Megan Spitzer, research assistant; Scott Whittaker, manager, scientific imaging; Helen James,
research zoologist and curator of birds; and Torben Rick, curator of
North American Archaeology, all at the Natural Museum of Natural History, Smithsonian Institution. Glenn R. Summerhayes, professor of archaeology, University of Otago, New Zealand; and Zanell Brand, production scientist, Oudtshoorn Research Farm, Elsenburg, Department of Agriculture, Western
Cape Government, South Africa, also worked on the project.

The Smithsonian National Museum of Natural History, the National Science Foundation and Penn State's College of the Liberal Arts supported
this work.

========================================================================== Story Source: Materials provided by Penn_State. Original written by
A'ndrea Elyse Messer.

Note: Content may be edited for style and length.


========================================================================== Journal Reference:
1. Kristina Douglass, Dylan Gaffney, Teresa J. Feo, Priyangi
Bulathsinhala,
Andrew L. Mack, Megan Spitzer, Glenn R. Summerhayes. Late
Pleistocene/ Early Holocene sites in the montane forests of
New Guinea yield early record of cassowary hunting and egg
harvesting. Proceedings of the National Academy of Sciences, 2021;
118 (40): e2100117118 DOI: 10.1073/ pnas.2100117118 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2021/09/210927150526.htm

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