Zooarchaeology: Animals in the Archaeological Record

The most common artifact found on most archaeological sites is not a pot, a tool, or a weapon — it is a bone. Thousands upon thousands of animal bones, fragments of teeth, pieces of antler, and bits of shell fill the soil beneath our feet, and each one carries a story. That cow femur with cut marks across its shaft tells us how a family butchered their dinner five hundred years ago. That dog burial curled in a perfect circle beside a human grave whispers something about companionship and grief. That fish vertebra from a species that requires cold, clear water challenges everything we thought we knew about the medieval climate. Zooarchaeology — the study of animal remains from archaeological sites — is the discipline that reads these stories, and it has transformed our understanding of the human past.

What Is Zooarchaeology?

Zooarchaeology, also called archaeozoology or faunal analysis, is the systematic study of animal remains recovered from archaeological contexts. It draws on biology, ecology, anatomy, and archaeology to answer questions about human subsistence, economy, environment, and culture. Every animal bone from an archaeological site is a piece of evidence — about what people ate, how they raised and hunted animals, what the climate was like, how societies were organized, and what people believed about the natural world.

The Scope of the Discipline

Zooarchaeologists analyze bones, teeth, antlers, horn cores, shells, scales, and other animal hard tissues. They identify each specimen to species, element (which bone), and portion (which part of the bone). They record modifications — cut marks from butchery, chop marks from dismemberment, burning from cooking or disposal, gnaw marks from carnivores or rodents. They count specimens, estimate the minimum number of individuals (MNI) represented, and calculate the relative abundance of different species. They collect measurements for reconstructing body size, sex, and age at death. They sample bones for stable isotope analysis, ancient DNA, radiocarbon dating, and histology.

Why Animals Matter

Animals have been central to human life for as long as our species has existed. They have been food, clothing, tools, transportation, companionship, and objects of worship. The domestication of animals was one of the most transformative events in human history, reshaping everything from diet and economy to social structure and disease ecology. Understanding human-animal relationships through zooarchaeology is essential for understanding the human story itself.

Reconstructing Ancient Diets

Perhaps the most straightforward application of zooarchaeology is reconstructing what people ate. Analysis of animal bones from occupation sites reveals the species that were consumed, the parts of the animal that were eaten, and the butchery methods used to process carcasses.

Meat, Fat, and Marrow

Butchery marks on bones reveal which animals were being processed and how. Intensive butchery — splitting long bones for marrow extraction, crushing bones for grease rendering, scraping the last scraps of meat from vertebrae — indicates resource stress or efficient utilization. Light butchery, with meatier cuts removed cleanly, suggests abundance or selective access. At the Mesolithic site of Star Carr in Yorkshire, zooarchaeologists identified intensive processing of red deer carcasses, with every element present and many bones split for marrow — consistent with a hunter-gatherer group using every available resource.

Seasonal Patterns

The age at death of animals reveals seasonality of occupation. If all sheep in a site were killed between October and December, the site was likely occupied in autumn and winter. If deer were harvested at various ages throughout the year, the site may have been occupied year-round. Incremental structures in teeth — cementum annuli, like tree rings — can reveal the season of death with remarkable precision. At the Neolithic site of Durrington Walls near Stonehenge, zooarchaeological analysis of pig teeth demonstrated that most pigs were slaughtered in midwinter, consistent with large-scale feasting during the winter solstice.

Status and Feasting

Zooarchaeology also reveals social differentiation in food consumption. Elite households in complex societies typically consumed more meat, larger animals, and different cuts of meat than commoners. At the Mississippian site of Cahokia near present-day St. Louis, feasting contexts contained high proportions of deer elements from prime meat-bearing parts, while domestic refuse contained more lower-quality cuts and smaller species. Zooarchaeologists have developed sophisticated methods for distinguishing feasting deposits from ordinary meals — feasting produces more complete skeletons, more prime-age animals, and more evidence of roasting over boiling.

Domestication: The Animal Revolution

Zooarchaeology has been central to understanding one of the most important transformations in human history — the domestication of animals.

Identifying Domestication

How do zooarchaeologists tell a domesticated animal from a wild one? Domestication leaves multiple traces in the skeleton. Domesticated animals are generally smaller than their wild ancestors — the classic “size reduction” signal of domestication, seen in cattle, pigs, sheep, goats, and dogs. They show changes in body proportions: shorter snouts, more crowded teeth, smaller horns. They exhibit changes in population structure — the presence of very young animals (culled for meat while the breeding population was maintained) alongside older animals (kept for milk, wool, or traction) indicates a managed herd rather than a hunted population.

The Major Domestications

The earliest animal domestication was the wolf-to-dog transition, likely occurring between 20,000 and 40,000 years ago, long before any other domestication. The first food animal domestications occurred in Southwest Asia around 10,000 BCE, when sheep and goats were brought under human management in the Zagros Mountains and Taurus Mountains. Cattle were domesticated separately in Southwest Asia and South Asia, and possibly in North Africa. Pigs were domesticated independently in Southwest Asia and China. The horse was domesticated on the Eurasian steppes around 3500 BCE, transforming warfare, trade, and mobility across the ancient world.

The Secondary Products Revolution

One of the most influential concepts in zooarchaeology is the “secondary products revolution,” proposed by Andrew Sherratt in the 1980s. Early animal domestication focused on primary products — meat, hide, and bone. Around 4000 to 3000 BCE, a suite of innovations emerged in the Near East and spread across Europe: the use of cattle for plowing and traction, the milking of sheep, goats, and cattle, the shearing of sheep for wool, and the use of donkeys and horses for transport. Zooarchaeological evidence for this revolution includes changes in age-sex profiles (more adults kept for milk, wool, or work), pathological changes in cattle bones from traction, and the presence of milk residues in pottery. For more on how zooarchaeologists reconstruct ancient economies, see Bioarchaeology.

Reconstructing Ancient Environments

Zooarchaeology is also a powerful tool for reconstructing past environments and climates.

Habitat Preferences

Different animal species have different habitat requirements. The presence of species that prefer cold, dry conditions versus those that prefer warm, wet conditions allows zooarchaeologists to reconstruct past climates. Rodent remains are particularly useful for this purpose — they are small, numerous, and often recovered in bulk through flotation and fine-sieving. At Zhoukoudian Cave in northern China, analysis of rodent assemblages associated with Homo erectus revealed cycles of glacial and interglacial conditions across hundreds of thousands of years.

Biogeography and Extinction

Zooarchaeology documents changes in the distribution of animal species over time. The extinction of Pleistocene megafauna — mammoths, mastodons, giant sloths, saber-toothed cats — is one of the great debates in zooarchaeology and paleontology. Did humans cause these extinctions through overhunting, or did climate change at the end of the last Ice Age doom these animals? Zooarchaeological evidence from sites across North America, Australia, and Eurasia shows that megafaunal extinctions closely tracked the arrival of modern humans on each continent, lending support to the overhunting hypothesis while not ruling out climate contributions.

Animals in Ritual and Belief

Animals have never been only food. Zooarchaeological evidence reveals the complex roles animals played in ritual, religion, and belief.

Burial and Sacrifice

Animal burials occur on archaeological sites around the world and in all time periods. At the Iron Age site of Pazyryk in Siberia, horses were buried with full riding equipment in frozen tombs, their bodies preserved by permafrost for over two thousand years — a testament to the central role of horses in Scythian cosmology. At the Roman site of Pompeii, the remains of animals caught in the Vesuvius eruption — dogs, donkeys, pigs, and a horse still wearing its bronze-studded harness — provide poignant evidence of animals’ presence in everyday Roman life.

Totemic and Symbolic Animals

Zooarchaeologists also study the selection of particular animals for symbolic use. The prevalence of raptor bones in Neolithic European burial contexts, the placement of pig mandibles in Iron Age British graves, the careful burial of dogs in pre-Columbian North America — all point to animals as carriers of meaning that transcends their economic value. At the Neolithic site of Çatalhöyük in Turkey, zooarchaeologists documented the installation of cattle horns and bucrania (cattle skulls) into house walls, suggesting that wild cattle held special ritual significance for the settlement’s inhabitants.

Methods in Zooarchaeology

Collection and Recovery

How animal bones are recovered determines what can be learned. Hand-collection during excavation systematically misses small bones — fish vertebrae, bird bones, rodent teeth, the bones of juvenile animals. Flotation, where soil is processed through water to separate light organic material, recovers plant remains and small bones. Fine-sieving using mesh sizes as small as one millimeter captures the smallest faunal remains. The best zooarchaeological assemblages come from sites where multiple recovery techniques are used.

Identification and Quantification

Identification depends on comparative collections — reference skeletons of known species against which archaeological specimens are matched. The Zooarchaeology Reference Collection at the Smithsonian Institution contains over 30,000 specimens representing more than 4,000 species. Quantification involves counting identifiable specimens (NISP), estimating minimum numbers of individuals (MNI), and calculating the weight of bone fragments — each method has strengths and limitations, and professional zooarchaeologists typically use multiple quantification methods.

Isotopic and DNA Analysis

Stable isotope analysis of carbon and nitrogen in bone collagen reveals the diets of ancient animals and, through them, the environments they inhabited. Strontium isotopes in tooth enamel reveal migration patterns — where an animal was born versus where it died. Ancient DNA analysis has identified the genetic relationships between archaeological animal populations and modern breeds, revealing the movement of domesticated animals across continents. For more on archaeological laboratory methods, see Artifact Analysis.

FAQ

What kinds of animal remains do zooarchaeologists study?

Zooarchaeologists study bones, teeth, antlers, horn cores, shells, fish scales, and occasionally preserved soft tissues, eggs, and fur. They analyze microscopic residues and chemical signatures in bones as well.

How can you tell if a bone is from a wild or domesticated animal?

Domesticated animals are typically smaller than their wild ancestors, show different body proportions (shorter snouts, smaller horns), and have population structures reflecting human management — young males culled for meat, females kept for breeding.

Do zooarchaeologists only study food animals?

No. They study all animals found on archaeological sites, including pets, working animals, pests, and animals used for raw materials (bone tools, antler handles, shell beads). Even incidental animals like rodents and birds provide important environmental information.

What is the difference between NISP and MNI?

NISP (Number of Identified Specimens) is a simple count of bone fragments identified to a particular species. MNI (Minimum Number of Individuals) is the minimum number of whole animals needed to account for all the bones recovered. Both are standard quantification methods with different biases.

How does zooarchaeology help with climate reconstruction?

The presence or absence of species with known habitat preferences — cold-adapted vs. warm-adapted species — allows reconstruction of past climates. Rodents and mollusks are especially useful for this purpose because they are abundant, small, and sensitive to environmental change.

Can zooarchaeology tell us about ancient trade?

Yes. The presence of animal species outside their natural range — Mediterranean fish in inland sites, African elephant ivory in Roman Britain, camel bones in medieval northern Europe — provides evidence for long-distance trade and exchange networks.