Between species, average brain size, when a corrective
formula for body size is applied, is a fair indicator of relative intelligence.
New MRI scans show that dolphin brains are four to five times
larger for their body size when compared to another animal of similar size, according to Lori Marino, a senior lecturer in neuroscience and behavioral biology at Emory University, and one of the world's leading dolphin experts.
Deaner says his findings support the hypothesis that absolute brain size matters more than brain size
adjusted for body size.
Despite expending more energy
for their body size when flying than any other animal, living in cold, harsh Arctic environments, diving over 100 meters in depth, and having to search for unpredictable food, even old birds return year after year to rear their chicks with no discernible change in their performance,» said lead author Dr. Kyle Elliott.
Once evolutionary relationships were factored in, the data showed that animals with big
brains for their body size need a significantly higher percentage of REM sleep — supporting a role in intelligence and cognitive function.
Here, we use a much larger sample of primates, more recent phylogenies, and updated statistical techniques, to show that brain size is predicted by diet, rather than multiple measures of sociality, after
controlling for body size and phylogeny.
They've been there pretty much since the first time Thompson put on pads — he once scored 11 touchdowns as an 11 - year - old in Pop Warner — and they
compensate for a body size that's one of the few things about him that's not eye - popping.
«Unlike many previous forager models, this one
accounts for body size and metabolic scaling,» Kempes explains.
Ostrander says that by identifying other dog
genes for body size and for traits such as leg length and head shape, researchers may learn more about growth and its disorders — especially cancer — in humans and their best friends.
«Although we knew that temperature might set a
maximum for body size,» Smith says, the new findings actually present a mechanism — and do so in a very detailed manner, showing «how animals responded to a particular temperature at a particular place at a particular time.»
Their jaws, or chelicerae, are the largest
for body size among the group of animals that possess these specialized mouthparts — including horseshoe crabs, sea spiders, and arachnids — and bear most of the structures used for their classification.
Using molar size as a
proxy for body size, the researchers looked at mammals in sediments from the fossil - rich Bighorn Basin of Wyoming.
Matched for body size, females with bigger horns managed to collect more dung and so provide better for their offspring.
After taking measurements and collecting observations on nine living primate species, including humans, Carrier concluded that the living apes with the shortest
legs for their body size, like gorillas and orangutans, are those that spend the least time in trees.
Animals with a relatively high metabolic
rate for their body size seem to need more non-REM sleep, suggesting that catching extra Zs simply helps them conserve precious energy.
Our
scan for body size (defined as log (body weight)-RRB- yielded several significant genomic associations, with the six strongest signals occurring at CFA15.44226659, CFAX.106866624, CFA10.11440860, CFAX.86813164, CFA4.42351982, and CFA7.46842856.
Adjusted for body size, the disproportionately supersized sperm outdoes such exuberant body parts as pheasant display feathers, deer antlers, scarab beetle horns and the forward - grasping forceps of earwigs.
Measurements revealed these species have more muscle capacity and their wings tended to be proportionately
larger for their body size than smaller species.
He knewthat adult turtles kept growing throughout their lives, and so hewondered whether the true variable might be body size rather than age.Once he ran the numbers again,
controlling for body size, he wasastonished to find that he got nearly identical results.
Adjusted
for body size...
One of the physical traits that Boston Terriers inherited from their English Bulldog forebears is a head size that's proportionally larger
for their body size than average.