Found across North America and Eurasia, Daphnia species mostly reproduce by parthenogenesis. In the spring and summer, a female D. magna will let her all-female offspring partially mature in her abdominal brood pouch. After several molts, these females will produce their own offspring by parthenogenesis. The onset of winter, drought, or other environmental stress will trigger some of D. magna’s developing parthenogenetic offspring to become males, who then mate with the parthenogenetic females. This method of sexual reproduction produces eggs with an extra shell layer that lets them survive the stressful period.
These things are cool. I work at a greenhouse nursery and noticed them swimming around in a water bin with the aquatic plants. I learned that they are water fleas, scientifically called Daphnia. Perrty awesome if ya ask me. They’re small planktonic crustaceans. I spent minutes tryna research these. So many minutes!! haha
A zookeeper dressed up in a giant panda suit carries panda cub Cao Gen at the Hetaoping Research and Conservation Center.
Scientists wear the panda suits to limit human interaction with the endangered bears, which are being left to fend for themselves in the new habitat so they can learn crucial survival skills and live in the wild without assistance.