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(单词翻译:双击或拖选)
A group of scientists has disputed a study published last year that estimated the intelligence of the dinosaur1 Tyrannosaurus rex to be similar to a baboon2's.
The group disputed last year's report from Suzana Herculano-Houzel at Vanderbilt University in Tennessee. It said the study did not use studies of reptiles4 like crocodiles and alligators5 to explain dinosaur brains.
Zoologist6 Kai Caspar is with the Heinrich Heine University in Germany. Caspar was the lead author of the new study published in The Anatomical Record.
Speaking of dinosaurs7 like T. rex, he said "their neuron numbers were likely not exceptional, especially for animals of their body mass."
But Herculano-Houzel stands by her research.
She said her work studied the "brain to body-size relationship" of modern-day theropod relatives such as ostriches8 and chickens. The brain size and number of neurons of those animals, she said, support her theory.
A theropod is a group of dinosaurs that includes T. rex.
She said only one issue is being disputed: "What was actually the size of dinosaur brains. Even then, we're talking about the difference between a T. rex brain being baboon or monkey sized."
Caspar said his research group also considered modern birds.
"Reptiles are certainly not as dim-witted as is commonly believed," he said. Speaking of T. rex, he noted9: "it was certainly a behaviorally sophisticated animal."
Caspar said he had additional concerns about Herculano-Houzel's research. One issue, he said, is that while humans, baboons10, other mammals and even birds have brains that fill the space protected by the skull11, "this is not the case for reptile3 species." He noted the brain of reptiles fills only about 30 to 50 percent of the space.
He also said it is not known how many neurons, or brain cells, were present in dinosaur brains.
"Looking at living animals, we see that neuron counts are actually not a good indicator12 of intelligence in the first place," Caspar added.
Caspar noted the study from 2023 assumed the brain filled the whole skull, which, he said, "was certainly not the case."
Scientists have been learning about dinosaurs for about 200 years. But much remains13 to be discovered.
Thomas Holtz is the co-author of the new study. He studies dinosaurs at the University of Maryland. He said estimating the intelligence of animals that lived over 60 million years ago is difficult.
"It would be nice if we could just estimate one number and unravel14 the whole complexity15 of an animal's biology and lifestyle, but nature isn't like that," Holtz said.
He said T. rex probably had an intelligence level somewhere between that of birds and reptiles.
"Many of our common assumptions don't really hold up when you...examine what real animals do in the real world," he said.
I'm Dan Friedell.
Dan Friedell adapted this story for Learning English based on a report by Reuters.
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Words in This Story
reptile -n. a class of animals with backbones16 which lays eggs, is covered with scaly17 skin, and has a low body temperature
neuron -n. a special cell of the nervous system of many animals
stand by -v. (phrasal) to support or to continue to support although there is opposition18
dim-witted -adj. not intelligent
sophisticated -adj. extremely smart or complex
species -n. a group of animals or plants that can have young with one another and is a group smaller than a genus
skull -n. the bones of the head
indicator -n. something that shows the presence of something else
assume -v. to think that something is true without knowing or confirming it completely
unravel -v. to come apart or to take something apart in an effort to understand it
1 dinosaur | |
n.恐龙 | |
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2 baboon | |
n.狒狒 | |
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3 reptile | |
n.爬行动物;两栖动物 | |
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4 reptiles | |
n.爬行动物,爬虫( reptile的名词复数 ) | |
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5 alligators | |
n.短吻鳄( alligator的名词复数 ) | |
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6 zoologist | |
n.动物学家 | |
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7 dinosaurs | |
n.恐龙( dinosaur的名词复数 );守旧落伍的人,过时落后的东西 | |
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8 ostriches | |
n.鸵鸟( ostrich的名词复数 );逃避现实的人,不愿正视现实者 | |
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9 noted | |
adj.著名的,知名的 | |
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10 baboons | |
n.狒狒( baboon的名词复数 ) | |
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11 skull | |
n.头骨;颅骨 | |
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12 indicator | |
n.指标;指示物,指示者;指示器 | |
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13 remains | |
n.剩余物,残留物;遗体,遗迹 | |
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14 unravel | |
v.弄清楚(秘密);拆开,解开,松开 | |
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15 complexity | |
n.复杂(性),复杂的事物 | |
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16 backbones | |
n.骨干( backbone的名词复数 );脊骨;骨气;脊骨状物 | |
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17 scaly | |
adj.鱼鳞状的;干燥粗糙的 | |
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18 opposition | |
n.反对,敌对 | |
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