Robert Bakker is a paleontologist known for changing how scientists and the public think about dinosaurs. Instead of viewing dinosaurs as slow, cold-blooded reptiles, he argued that many were active, fast-growing animals with complex behavior. His work helped spark the Dinosaur Renaissance, a major shift in dinosaur science during the late 20th century.
This matters because paleontology uses fossils as evidence to test ideas about how extinct animals lived.
Key Facts
- The Dinosaur Renaissance was a shift from viewing dinosaurs as sluggish reptiles to viewing many as active, dynamic animals.
- Bakker argued that some dinosaurs may have had high metabolic rates, similar in some ways to modern birds and mammals.
- Bone histology studies fossil bone microstructure to estimate growth rate and activity level.
- Speed can be estimated from footprints using stride length, hip height, and trackway patterns.
- Predator-prey ratios in fossil communities can give clues about metabolism and energy needs.
- Modern birds are living dinosaurs because they evolved from theropod dinosaurs.
Vocabulary
- Paleontology
- Paleontology is the scientific study of ancient life using fossils, rocks, and related evidence.
- Dinosaur Renaissance
- The Dinosaur Renaissance was a scientific movement that reinterpreted dinosaurs as active, diverse, and often birdlike animals.
- Endothermy
- Endothermy is the ability of an animal to maintain body temperature mostly through internal metabolic heat.
- Bone histology
- Bone histology is the study of microscopic structures in bone that can reveal growth patterns and physiology.
- Trackway
- A trackway is a series of fossil footprints that records how an animal moved across a surface.
Common Mistakes to Avoid
- Assuming Bakker proved all dinosaurs were warm-blooded is wrong because different dinosaur groups may have had different metabolisms and the evidence is still evaluated case by case.
- Calling dinosaurs extinct without exception is wrong because birds are living descendants of theropod dinosaurs.
- Using one fossil trait as final proof is wrong because paleontologists combine many evidence types, including bones, tracks, eggs, nesting sites, and comparisons with living animals.
- Thinking fossils only show shape is wrong because fossils can also preserve growth lines, injuries, bite marks, footprints, and environmental clues.
Practice Questions
- 1 A dinosaur trackway shows a stride length of 3.6 m. If the estimated hip height is 1.8 m, what is the stride length divided by hip height ratio?
- 2 A fossil bone grew from 2 cm diameter to 8 cm diameter over 6 years. What was the average increase in diameter per year?
- 3 Explain how fossil bone structure, trackways, and predator-prey ratios could all support the idea that some dinosaurs were highly active animals.