Female komodo dragons don't need no man to make more dragons

Back in August 2019, a female komodo dragon named Charlie gave birth to three little dragons at the Chattanooga Zoo. The zookeepers had previously tried to hook her up with a sweet dragon fella named Kadal, but the two never really seemed to hit it off — not that the staff could observe, anyway. And now that they've tested the DNA of young Onyx, Jasper, and Flint, it's finally confirmed: Charlie and Kadal did not hit it off at all, so Charlie took it upon herself to bring the kids into the world. From the Chattanooga Times Free Press:

The DNA results showed the babies were the result of parthenogenesis, which is a type of reproduction where the female produces offspring without male fertilization. […] Female Komodo dragons carry WZ sex chromosomes, while males carry the ZZ type. When parthenogenesis happens, the mother can only create WW or ZZ eggs. Since eggs with the sex chromosomes of WW aren't viable, only ZZ eggs are left to produce all male hatchlings. Parthenogenesis is considered very rare, with the first case of a successful parthenogenesis reproduction in Komodo dragons recorded in 2006.

I was personally fascinated to learn that there are so many different categorizations of asexual reproduction, and that it can indeed occur spontaneously in vertebrates without any fertilization. In 2007, there was apparently a bit of a scandal involving a lab-grown human embryo that was allegedly cloned, but turned it to be a productive parthenogenesis. There are also living human beings with some unique chimeric complications in which they were both fertilized by a male, but also underwent some kind of parthenogenesis at the same time, resulting in a male offspring with Y-chromosomes in his skin, but not in his blood. Read the rest

Mouse deer, thought to be extinct spotted for first time in 30 years

A species of mouse deer called the silver-backed chevrotain was thought to be lost to science after 30 years of no sightings, but a video camera in a Vietnam forest captured one as it foraged for food.

From The Guardian:

The pictures of the rabbit-sized animal, also known as the silver-backed chevrotain, are the first to be taken in the wild and come nearly 30 years after the last confirmed sighting.

“We had no idea what to expect, so I was surprised and overjoyed when we checked the camera traps and saw photographs of a chevrotain with silver flanks,” said An Nguyen, a scientist and expedition team leader at Global Wildlife Conservation (GWC).

Image: YouTube Read the rest