Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news about fascinating discoveries, scientific developments and more. An extinct ribbon-like sea creature the size of a human hand was one of the first animals to develop a precursor to a backbone. Scientists recently identified the animal’s nerve cord by using a reverse … Read more
Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news about fascinating discoveries, scientific developments and more. An extinct ribbon-like sea creature the size of a human hand was one of the first animals to develop a precursor to a backbone. Scientists recently identified the animal’s nerve cord by using a reverse … Read more
The axolotl (Ambystoma mexicanum) fell into mythology centuries ago; the Aztecs believed that the first axolotl appeared in the lake system surrounding modern-day Mexico City when the powerful underworld god Xolotl transformed himself into a small, feathered amphibian to escape capture. Among the first modern zoo animals, 34 axolotls were brought from Mexico (along with … Read more