Menu

Warm-Blooded Dinos?

Evidence that large dinosaurs had body temperatures similar to modern-day mammals suggests they were either endothermic or extremely good at conserving body heat.

Jun 24, 2011
Jef Akst

WIKIMEDIA COMMONS, DMITRY BOGDANOV

A technique called clumped-isotope thermometry, usually used for reconstructing ancient climates, is shedding light on the age old debate over whether dinosaurs were warm- or cold-blooded. Computer models of heat loss and energy use, oxygen isotope measures, and other techniques have all yielded conflicting results. While evidence of energetic behaviors and high growth rates have suggested that the extinct reptiles’ veins may have carried warm blood throughout the body, some paleontologists have argued that an endothermic animal of that size would quickly overheat.

Comparing levels of various chemical isotopes in the enamel of fossilized dinosaur teeth, which form at different rates depending on the temperatures at the time of the chemical decomposition, evolutionary biologist Robert Eagle of the California Institute of Technology in Pasadena estimated that two large species of dinosuars—the 30-ton Brachiosaurus and the 50-ton Camarasaurus—had body temperatures between 36° and 38°C, nearly identical to modern mammals. "It's like a thermometer," Eagle told ScienceNOW. The results were published last week in Science.

But that doesn’t mean that dinosaurs maintained their body heat the same way today’s mammals do. Their warm blood may simply be the result of the warm environment they inhabited, for example. In fact, if the ancient giants were endothermic like modern mammals, the insulating properties of their enormous size would have likely caused their temperatures to rise above 40°C—which would have killed them. If dinos were indeed endothermic, they must have also had a cooling system in place, Eagle and his colleagues suggest, perhaps losing heat through their necks and tails.

September 2018

The Muscle Issue

The dynamic tissue reveals its secrets

Marketplace

Sponsored Product Updates

Enabling Genomics-Guided Precision Medicine

Enabling Genomics-Guided Precision Medicine

Download this eBook from Qiagen to learn more about the promise of precision medicine and how QCITM Interpret can help deliver better care with better knowledge.

Best Practices for Sample Preparation and Lipid Extraction from Various Samples

Best Practices for Sample Preparation and Lipid Extraction from Various Samples

Download this white paper from Bertin Technologies to learn how to extract and analyze lipid samples from various models!

Bio-Rad Launches CHT Ceramic Hydroxyapatite XT Media and Nuvia HP-Q Resin for Process Protein Purification

Bio-Rad Launches CHT Ceramic Hydroxyapatite XT Media and Nuvia HP-Q Resin for Process Protein Purification

Bio-Rad Laboratories, Inc. (NYSE: BIO and BIOb), a global leader of life science research and clinical diagnostic products, today announced the launch of two new chromatography media for process protein purification: CHT Ceramic Hydroxyapatite XT Media and Nuvia HP-Q Resin.

Immunophenotypic Analysis of Human Blood Leukocyte Subsets

Immunophenotypic Analysis of Human Blood Leukocyte Subsets

Download this application note from ACEA Biosciences, Inc., to find out how to perform an immunophenotypic analysis of a human blood sample utilizing 13 fluorescent markers using a compact benchtop flow cytometer equipped with 3 lasers!