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The concept of warm-blooded and cold-blooded animals is outdated because there are actually tons of different animal thermoregulation strategies.
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To learn more about this topic, start your googling with these keywords:
- Thermoregulation: the strategy through which the body maintains its internal temperature.
- Endotherm: an animal that generates most of its heat internally.
- Ectotherm: an animal that relies on environmental heat sources.
- Mesotherm: an animal with an intermediate heat generating strategy.
- Poikilotherm: an animal whose internal temperature varies considerably.
- Heterotherm: an animal that sometimes keeps its body temperature the same and sometimes lets it vary.
- Homeotherm: an animal whose internal temperature does not change much.
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REFERENCES
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Tøien, Ø., Blake, J. & Barnes, B.M. Thermoregulation and energetics in hibernating black bears: metabolic rate and the mystery of multi-day body temperature cycles. J Comp Physiol B 185, 447–461 (2015). https://doi.org/10.1007/s00360-015-0891-y
Paladino, F.V., O’Connor, M.P., Spotila, J.R. 1990. Metabolism of Leatherback Turtles, Gigantothermy, and Thermoregulation of Dinosaurs. Nature. Vol.344;858-860. REtrieved from: https://www.nature.com/articles/344858a0
Morrissette, J.M. (2003). Characterization of ryanodine receptor and Ca2+-ATPase isoforms in the thermogenic heater organ of blue marlin (Makaira nigricans). Journal of Experimental Biology, 206(5), 805-812. Retrieved from: https://pubmed.ncbi.nlm.nih.gov/12547935/
Polymeropoulos, Elias. (2022) Personal Communication. University of Tasmania. https://www.utas.edu.au/profiles/staff/imas/elias-polymeropoulos