Dino Q&A
Life reconstruction of Styracosaurus. Image credit: Nobu Tamura
Presented here is a list of some of the most commonly asked questions regarding dinosaurs.
Could Tyrannosaurus rex (T. rex) beat Spinosaurus in a fight?
A fight between Tyrannosaurus rex and Spinosaurus aegyptiacus would never have occurred because the two species lived in completely different times and places. T. rex inhabited North America during the Late Cretaceous, around 68–66 million years ago (Holtz, 2012). Spinosaurus lived in North Africa during the Mid-Cretaceous, approximately 100–93 million years ago (Sereno et al., 1998; Brusatte et al., 2010). This means they were separated by not only vast oceans and geographic exspanses, but also by tens of millions of years of evolution. Therefore any encounter between them impossible in reality.
What exactly is a dinosaur?
Dinosaurs are a diverse group of reptiles belonging to the clade Dinosauria, which first appeared during the Triassic Period about 243–233 million years ago (Benton et al., 2015). They are defined by specific skeletal traits such as an upright stance with legs positioned directly beneath the body (Padian & Chiappe, 1998).
When did dinosaurs live?
Dinosaurs lived during the Mesozoic Era, often called the Age of Dinosaurs, which spanned from about 252 to 66 million years ago (Gradstein et al., 2012). It is divided into three periods, the Triassic, the Jurassic, and the Cretaceous.
How did dinosaurs go extinct?
Most scientists agree that dinosaurs went extinct due to a mass extinction event 66 million years ago, triggered by a massive asteroid impact near Chicxulub, Mexico (Alvarez et al., 1980), and worsened by volcanic activity and climate disruption (Courtillot & Renne, 2003). One lineage of dinosaur still exists today, the birds (which are a derived form of theropod) (Brusatte et al., 2015).
What was the biggest dinosaur?
The largest known dinosaur is likely Argentinosaurus, a titanosaur estimated to reach 30–35 meters (98–115 feet) in length and weighing up to 70–100 metric tons (Mazzetta et al., 2004).
What was the smallest dinosaur?
The smallest known dinosaur is Microraptor, about the size of a crow, with a body length around 77 cm (2.5 ft) (Xu et al., 2003).
How do scientists know what dinosaurs looked like?
Paleontologists use fossilized bones, skin impressions (which reveal scales and texture), and even preserved pigments to reconstruct dinosaur appearance (Vinther et al., 2010). The musculature of dinosaurs is derived from muscle scars, which can be seen on their bones (Carrano & Hutchinson, 2002). These scars indicate the locations where muscles, tendons, and ligaments were connected to the skeleton. Fossilized melanosomes in feathers have even revealed coloration in some species. In the absence of direct evidence, researchers utilize comparative anatomy, examining contemporary relatives such as birds and crocodiles, to deduce characteristics like soft tissues and organ structures, leading to progressively detailed and scientifically precise reconstructions (Witmer, 1995).
Could dinosaurs have had feathers?
Yes, many theropods, especially smaller species, had feathers or feather-like structures (Godefroit et al., 2014). Feathers likely evolved for insulation or display before being adapted for flight in birds.
How fast could dinosaurs run?
Speeds varied by species. Small theropods like Velociraptor may have run up to 40 km/h (25 mph) (Persons & Currie, 2016), while large sauropods were much slower, moving at 5–10 km/h (3–6 mph) (Alexander, 1989).
Did dinosaurs take care of their young?
Evidence such as fossilized nests, eggs, and juvenile groups suggests that some dinosaurs cared for their offspring, especially hadrosaurs and theropods (Horner & Makela, 1979).
Could dinosaurs swim?
Many dinosaur species could in fact swim. Trackways and anatomical evidence show that some theropods and sauropods were capable swimmers, likely crossing rivers or lagoons (Shi et al., 2012).
A fight between Tyrannosaurus rex and Spinosaurus aegyptiacus would never have occurred because the two species lived in completely different times and places. T. rex inhabited North America during the Late Cretaceous, around 68–66 million years ago (Holtz, 2012). Spinosaurus lived in North Africa during the Mid-Cretaceous, approximately 100–93 million years ago (Sereno et al., 1998; Brusatte et al., 2010). This means they were separated by not only vast oceans and geographic exspanses, but also by tens of millions of years of evolution. Therefore any encounter between them impossible in reality.
What exactly is a dinosaur?
Dinosaurs are a diverse group of reptiles belonging to the clade Dinosauria, which first appeared during the Triassic Period about 243–233 million years ago (Benton et al., 2015). They are defined by specific skeletal traits such as an upright stance with legs positioned directly beneath the body (Padian & Chiappe, 1998).
When did dinosaurs live?
Dinosaurs lived during the Mesozoic Era, often called the Age of Dinosaurs, which spanned from about 252 to 66 million years ago (Gradstein et al., 2012). It is divided into three periods, the Triassic, the Jurassic, and the Cretaceous.
How did dinosaurs go extinct?
Most scientists agree that dinosaurs went extinct due to a mass extinction event 66 million years ago, triggered by a massive asteroid impact near Chicxulub, Mexico (Alvarez et al., 1980), and worsened by volcanic activity and climate disruption (Courtillot & Renne, 2003). One lineage of dinosaur still exists today, the birds (which are a derived form of theropod) (Brusatte et al., 2015).
What was the biggest dinosaur?
The largest known dinosaur is likely Argentinosaurus, a titanosaur estimated to reach 30–35 meters (98–115 feet) in length and weighing up to 70–100 metric tons (Mazzetta et al., 2004).
What was the smallest dinosaur?
The smallest known dinosaur is Microraptor, about the size of a crow, with a body length around 77 cm (2.5 ft) (Xu et al., 2003).
How do scientists know what dinosaurs looked like?
Paleontologists use fossilized bones, skin impressions (which reveal scales and texture), and even preserved pigments to reconstruct dinosaur appearance (Vinther et al., 2010). The musculature of dinosaurs is derived from muscle scars, which can be seen on their bones (Carrano & Hutchinson, 2002). These scars indicate the locations where muscles, tendons, and ligaments were connected to the skeleton. Fossilized melanosomes in feathers have even revealed coloration in some species. In the absence of direct evidence, researchers utilize comparative anatomy, examining contemporary relatives such as birds and crocodiles, to deduce characteristics like soft tissues and organ structures, leading to progressively detailed and scientifically precise reconstructions (Witmer, 1995).
Could dinosaurs have had feathers?
Yes, many theropods, especially smaller species, had feathers or feather-like structures (Godefroit et al., 2014). Feathers likely evolved for insulation or display before being adapted for flight in birds.
How fast could dinosaurs run?
Speeds varied by species. Small theropods like Velociraptor may have run up to 40 km/h (25 mph) (Persons & Currie, 2016), while large sauropods were much slower, moving at 5–10 km/h (3–6 mph) (Alexander, 1989).
Did dinosaurs take care of their young?
Evidence such as fossilized nests, eggs, and juvenile groups suggests that some dinosaurs cared for their offspring, especially hadrosaurs and theropods (Horner & Makela, 1979).
Could dinosaurs swim?
Many dinosaur species could in fact swim. Trackways and anatomical evidence show that some theropods and sauropods were capable swimmers, likely crossing rivers or lagoons (Shi et al., 2012).
References
Alexander, R. M. (1989). Dynamics of Dinosaurs and Other Extinct Giants.
Alvarez, L. W., Alvarez, W., Asaro, F., & Michel, H. V. (1980). Extraterrestrial cause for the Cretaceous–Tertiary extinction. Science.
Benton, M. J., et al. (2015). Dinosaur origins and the timing of evolutionary radiations.
Brusatte, S. L., et al. (2010). Spinosaurus ecology and evolution.
Brusatte, S. L., et al. (2015). The origin and diversification of birds.
Carrano, M. T., & Hutchinson, J. R. (2002). Pelvic and hindlimb reconstruction in theropods.
Courtillot, V., & Renne, P. (2003). Deccan volcanism and mass extinction.
Godefroit, P., et al. (2014). A Jurassic feathered dinosaur.
Gradstein, F. M., et al. (2012). The Geologic Time Scale 2012.
Holtz, T. R. (2012). Dinosaurs: The Most Complete, Up-to-Date Encyclopedia.
Horner, J. R., & Makela, R. (1979). Nesting behavior in dinosaurs.
Mazzetta, G. V., et al. (2004). Body size of Argentinosaurus.
Padian, K., & Chiappe, L. (1998). Origins of birds and dinosaurs.
Persons, W. S., & Currie, P. J. (2016). Running capability of dromaeosaurs.
Sereno, P. C., et al. (1998). A long-snouted predatory dinosaur from Africa.
Shi, L., et al. (2012). Dinosaur swimming trackways.
Vinther, J., et al. (2010). Fossil melanosomes reveal coloration.
Witmer, L. M. (1995). Reconstruction of soft tissues via anatomy.
Xu, X., et al. (2003). Microraptor gui description.
Alexander, R. M. (1989). Dynamics of Dinosaurs and Other Extinct Giants.
Alvarez, L. W., Alvarez, W., Asaro, F., & Michel, H. V. (1980). Extraterrestrial cause for the Cretaceous–Tertiary extinction. Science.
Benton, M. J., et al. (2015). Dinosaur origins and the timing of evolutionary radiations.
Brusatte, S. L., et al. (2010). Spinosaurus ecology and evolution.
Brusatte, S. L., et al. (2015). The origin and diversification of birds.
Carrano, M. T., & Hutchinson, J. R. (2002). Pelvic and hindlimb reconstruction in theropods.
Courtillot, V., & Renne, P. (2003). Deccan volcanism and mass extinction.
Godefroit, P., et al. (2014). A Jurassic feathered dinosaur.
Gradstein, F. M., et al. (2012). The Geologic Time Scale 2012.
Holtz, T. R. (2012). Dinosaurs: The Most Complete, Up-to-Date Encyclopedia.
Horner, J. R., & Makela, R. (1979). Nesting behavior in dinosaurs.
Mazzetta, G. V., et al. (2004). Body size of Argentinosaurus.
Padian, K., & Chiappe, L. (1998). Origins of birds and dinosaurs.
Persons, W. S., & Currie, P. J. (2016). Running capability of dromaeosaurs.
Sereno, P. C., et al. (1998). A long-snouted predatory dinosaur from Africa.
Shi, L., et al. (2012). Dinosaur swimming trackways.
Vinther, J., et al. (2010). Fossil melanosomes reveal coloration.
Witmer, L. M. (1995). Reconstruction of soft tissues via anatomy.
Xu, X., et al. (2003). Microraptor gui description.