How Birds-To-Be Get Oxygen Inside Eggs

Your body needs oxygen to function — and that was true even before you were born. As you grew inside your mother’s womb, even before you had working lungs, your cells were crying out for oxygen. And your mother kindly answered that call. Oxygen and nutrients from her blood made their way down your umbilical cord, through your belly button, and fueled your body.

Now consider a chick — before it has hatched. It’s cut off from its mother by a hard shell and a couple membranes. There’s no way for the hen to get her still-developing offspring the oxygen it desperately needs; the pre-hatchling is on its own.

So why don’t bird embryos suffocate inside their eggs?

In Skunk Bear’s newest episode, we use the magic of animation to take you inside an egg and explore the delicate system that keeps these little things alive.

 


Read original article here.

Geologists find clues that early humans island-hopped their way into the Americas

How and when did early humans first arrive in the Americas? The answer may lie along the Northern America’s Pacific Coast. Experts believe early humans travelled from Siberia to Alaska across a land bridge. But what happened next has been far more difficult to pinpoint. The conventional story suggests the earliest North American settlers then…

via Geologists find clues that early humans island-hopped their way into the Americas — Quartz

Paleontology and western bias

Paleontology, like much else in the cultural landscape, has a strong western influence and bias. Students are more likely than not to be given textbooks and external readings from Europe and North America no matter where they are in the world. I often think about my own experiences as a paleontology student in France now…

via Life may have started in Africa, but the study of African fossils is still undervalued — Quartz

Dinosaurs Took Between 3 and 6 Months to Hatch

Non-avian dinosaurs took between three and six months to hatch from their eggs, according to a study that examined the teeth of fossilized dinosaur embryos. Scientists have long assumed dinosaur incubation was similar to the rapid incubation of birds, which hatch within 11 to 85 days. However, the study found that dinosaurs aligned more with…

via Dinosaurs Took Between 3 and 6 Months to Hatch, Study Finds — TIME