ADVERTISEMENT
  About the SA Blog Network

Posts Tagged "eggs"

Anthropology in Practice

Beyond Ishtar: The Tradition of Eggs at Easter

Eggs occupy a special status during Easter observances. They’re symbols of rebirth and renewal—life bursts forth from this otherwise plain, inanimate object that gives no hint as to what it contains. In this regard it is a handy symbol for the resurrection of Jesus Christ, but it is is a symbol that has held this [...]

Keep reading »
Anthropology in Practice

Editor’s Selections: Eggs, Flimsy houses, Summer spending, and Fingerprints

Featured this week in my ResearchBlogging.org column: At Powered by Osteons, Kristina Killgrove has a fantastic seasonal post up on the symbolism of eggs and their role in burials. At Gambler’s House, teofilo clears up usage of the word “flimsy” in the context of Mississippian houses by highlighting an interesting bias that the word contributes. [...]

Keep reading »
Extinction Countdown

Rare Iguana is Endangered Because People Like to Eat Egg-Carrying Females

Valle de Aguán spiny-tailed iguana

It’s a simple equation, really: If a species can’t reproduce, it will go extinct. A critically endangered species in Honduras faces that risk in a notable way. It turns out that the people who coexist with Valle de Aguán spiny-tailed iguanas (Ctenosaura melanosterna) not only like to eat the lizards they prefer the taste of [...]

Keep reading »
Extinction Countdown

Century-Old Egg Answers Mystery about Critically Endangered Bird

jerdon's courer egg

Few people have ever seen a Jerdon’s courser (Rhinoptilus bitorquatus), a critically endangered nocturnal bird that lives in a tiny scrub forest in southeastern India. And until recently it was thought that no one had ever seen a Jerdon’s courser nest or egg. But it turns out that a single egg from one of these [...]

Keep reading »
Extinction Countdown

Egg Swap for Operatic New Zealand Birds a Success, but Invasive Predators Create Discord

kokako david cook sq

New Zealand used to be home to two subspecies of the rare birds known as kōkako (Callaeas cinereus). Today only one subspecies remains. The South Island kōkako was last seen in 1967 and was finally declared extinct six years ago. Conservationists are determined to save the remaining subspecies, which can still be found in the [...]

Keep reading »
Not bad science

Birds arrange eggs in their nests to better detect imposters

Most birds build their own nests and incubate their own eggs. However, some birds like the cuckoo have managed to get around this inconvenience by simply laying their eggs in the nests of other species and letting someone else do the hard work of keeping the eggs warm and protected until the chick hatches. The [...]

Keep reading »
Observations

Quails Demonstrate Mastery of Camouflage to Protect Their Colorful Eggs

quail egg camouflage

A quail egg is like a protein-filled, free lunch, waiting on the ground to be spotted—and devoured—by a predator. But the Japanese quail (Coturnix japonica) seems to have mastered an impressive level of camouflage-manipulating behavior to keep her eggs off the menu. Female Japanese quails tend to lay distinctive eggs that are specific to each [...]

Keep reading »
Observations

Baby Mice Born from Eggs Made from Stem Cells

mouse egg stem cell babies

Stem cells have been coaxed into creating everything from liver cells to beating heart tissue. Recently, these versatile cells were even used to make fertile mouse sperm, suggesting that stem cell technology might eventually be able to play a role in the treatment of human infertility. Now two types of stem cells have been turned [...]

Keep reading »
Observations

50 Shades of Sea Slug Sex: It’s Stranger Than You Think

sea slug sex traumatic mating female

Two-part barbed penises, a physical struggle and 20 minutes of penetration. That’s how some sea slugs do it. But the real shocker is that, for one species at least, those in the female role seem to engage in these bizarre, violent sexual encounters more often than might be biologically necessary. Nothing about sea-slug sex sounds [...]

Keep reading »
Observations

Dogma Overturned: Women Can Produce New Eggs [Video]

A study led by Jonathan Tilly of the Massachusetts General Hospital overturns the decades-long idea that women are born with all the eggs they will ever have. It reports that women of reproductive age carry ovarian stem cells, meaning that they can produce new eggs. Tilly’s team, which made a similar finding in mice in [...]

Keep reading »

More from Scientific American

Scientific American Holiday Sale

Scientific American Mind Digital

Get 6 bi-monthly digital issues
+ 1yr of archive access for just $9.99

Hurry this offer ends soon! >

X

Email this Article

X