Directions: Use the information provided and your knowledge of Life Science to answer the following questions. Show all work where necessary.
Directions: Use the information provided and your knowledge of Life Science to answer the following questions. Show all work where necessary.
Fossilized footprints - called trackways - provide direct evidence of how ancient animals moved, behaved, and interacted with their environments. Unlike skeletons, which show structure, trackways record behavior in action: walking, running, turning, or even moving in groups.
Trackways are preserved when an animal walks across soft sediment, such as mud or sand, that later hardens into rock. By measuring stride length, track size, and trackway spacing, scientists can estimate an animal’s speed, posture, and sometimes group behavior.
At several sites in North America, China, and Argentina, paleontologists have discovered parallel trackways made by multiple dinosaurs moving in the same direction. In one site in Texas, sauropod (long-necked dinosaur) trackways show large and small individuals traveling together, suggesting herding behavior and parental care. The similar stride lengths and consistent spacing imply that the animals were moving as a coordinated group rather than randomly.
At other sites, different species’ tracks appear in the same layers - sometimes overlapping - revealing interactions between predators and prey. Measurements of track spacing and depth also show differences in walking vs. running speeds. Using modern comparisons, scientists can estimate speed using the formula:
where g is gravitational acceleration. Data suggest some theropods (two-legged carnivores) were running at speeds over 20 km/h, while large sauropods moved much slower.
Together, these data show that trace fossils like footprints can reveal both the organisms that made them and the environments and behaviors of long-extinct species.
Site Location | Dominant Track Type | Trackway Pattern | Inferred Behavior |
|---|---|---|---|
Paluxy River, Texas (USA) | Sauropod | Parallel trackways, adults & juveniles | Group travel / herding |
Shandong, China | Theropod | Alternating, increasing stride length | Running or pursuit |
La Rioja, Argentina | Ornithopod | Consistent spacing & direction | Coordinated group movement |
Isle of Skye, Scotland | Sauropod + Theropod | Overlapping predator/prey tracks | Predation interaction |
Make a claim, provide the evidence, and explain your reasoning for the statement:
“Fossilized trackways provide evidence that some dinosaurs moved in groups and interacted with their environments.”
Claim:
Evidence:
Reasoning:
Refer to Table 1 in the Dinosaur Trackways and Behavior resource.
Compare the trackway patterns and inferred behaviors between at least two sites. What do the differences reveal about dinosaur activity?
What makes trackway fossils especially useful for understanding dinosaur behavior?
Why might traveling in groups, as seen in the Paluxy River trackways, have helped dinosaurs survive?
Explain how different trackway patterns (running, walking, overlapping) show that some dinosaurs were better suited to certain environments than others.