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Dinosaurs neither hot nor cold blooded


Posted on Friday, 13 June, 2014 | Comment icon 11 comments

Dinosaur blood was 'just right'. Image Credit: Sergio Kaminski
Scientists believe they have finally answered the age old question about the nature of dinosaur blood.
Being reptiles, dinosaurs were originally believed to be cold blooded, but as more was learned about their behavior it became more and more likely that they were actually warm blooded like mammals.

Now researchers at the University of New Mexico have turned both these theories upside-down by determining that dinosaurs may have been neither cold nor warm blooded but were actually somewhere in between.

The study involved analyzing the connection between growth rate and energy use in both living and extinct species of vertebrates and then comparing this data to the growth rings in dinosaur fossils to determine their metabolic rates.

The same type of blood can still be found today in species such as sharks, turtles and tuna.

Source: Discovery News | Comments (11)

Tags: Dinosaur, Blood

Recent comments on this story
Comment icon #2 Posted by Imaginarynumber1 on 13 June, 2014, 17:12
Just read this article and wanted to say this thesis seems like a perfectly satisfactory way to dodge the question. It clearly states that they were probably mesothermic. How is that dodging the question?
Comment icon #3 Posted by bubblykiss on 13 June, 2014, 17:44
I was too delighted in my pre-coffee whit to fully think before posting. The mistake is mine.
Comment icon #4 Posted by alfonso on 13 June, 2014, 23:04
bet they were hot blooded when they got wiped out...
Comment icon #5 Posted by hammerclaw on 14 June, 2014, 1:15
Funny that the picture is a mammal-like reptile, not a dinosaur. If birds are descended from theropods and birds are warm-blooded, surely theropods were, too. Where did they get dinosaur blood, anyway?
Comment icon #6 Posted by hammerclaw on 14 June, 2014, 1:18
Funny that the picture is a mammal-like reptile, not a dinosaur. If birds are descended from theropods and birds are warm-blooded, surely theropods were, too. Where did they get dinosaur blood, anyway. "May have" doesn't make it conclusive.
Comment icon #7 Posted by alfonso on 14 June, 2014, 10:58
its not very a scientific answer saying they were probably 'actually somewhere in-between' is it??.. wheres the answer or term I don't understand? who are these scientists??. infact it screams of laziness a bet these scientists were faffing around as they do and it got to clocking off time on a Friday and they were way behind on there work and one of them says 'c'mon mate its home-time' ,..the other says 'but were not done here'..,, he then replied 'ah sod it mann its Friday I cant be assed to finish this task lets just say they were probably somewhere in-between.. and get out of here eh'...'y... [More]
Comment icon #8 Posted by Eldorado on 14 June, 2014, 11:44
Tepid-blooded?
Comment icon #9 Posted by Still Waters on 14 June, 2014, 11:51
neither cold nor warm blooded but were actually somewhere in between. Lukewarm? Reminds me of Goldilocks and the three bears. Not too hot - not too cold. They were 'just right'.
Comment icon #10 Posted by TheGreatBeliever on 15 June, 2014, 10:48
Really wonder if it was the meteor that wiped them out. So much theories on this. If only we could time travel
Comment icon #11 Posted by SameerPrehistorica on 15 June, 2014, 13:03
This is a question i asked a Paleontologist longtime before that whether Dinosaurs are cold blooded or warm blooded and he said,that is not settled yet. I always imagined as some Dinosaurs were cold blooded and some of them being warm blooded.


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