Search Results for: Vertebrates
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19302
I beg to differ with the quote, attributed to Ethan Temeles in this article: “This is the first really unambiguous example of ecology playing a role in the morphological differences between the sexes.” The statement exhibits the annoyingly common practice among zoologists to think and generalize as if only animals (and, even worse, only vertebrates) […]
- Animals
Toothy valves control crocodile hearts
The odd cog teeth of the crocodile heart may be the first cardiac valve known to control blood flow actively.
- Paleontology
L.A.’s Oldest Tourist Trap
Modern excavations at the La Brea tar pits are revealing a wealth of information about local food chains during recent ice ages, as well as details about what happened to trapped animals in their final hours.
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What’s Worth Saving?
A fracas over a biological term could have huge consequences for conservation.
- Humans
Science News of the Year 2000
A review of important scientific achievements reported in Science News during the year 2000.
- Health & Medicine
First Line of Defense: Hints of primitive antibodies
After looking in primitive marine invertebrates that are considered to be close relatives to vertebrates, immunologists find families of genes that might provide clues as to how early immune systems evolved.
- Paleontology
First Family’s last stand
New evidence indicates that about 3.2 million years ago, at least 17 Australopithecus afarensis individuals were killed at the same time by large predators at an eastern African site.
- Animals
Stalking Larvae: How an ancient sea creature grows up
Scientists have finally observed living larvae of a sea lily, an ancient marine invertebrate related to starfish.
- Health & Medicine
Protein protects rat brains from strokes
Neuroglobin, a protein related to hemoglobin, may protect the brain during strokes.
- Ecosystems
Why didn’t the beetle cross the road?
Beetle populations confined to specific forest areas by roads seem to have lost some of their genetic diversity.
- Anthropology
Monkey Business
They're pugnacious and clever, and they have complex social lives—but do capuchin monkeys actually exhibit cultural behaviors?
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When to Change Sex
A research team contends that animals that routinely change sex, even those prompted by mate loss or other social cues, tend to do so when they reach 72 percent of their maximum size.
