The U.S. Fish and Wildlife Service has delisted 21 species from the Endangered Species Act due to extinction, the agency announced Monday. The service had proposed the delisting of nearly two dozen species in September 2021 due to extinction. Included in the group of animals now declared extinct are the Little Mariana fruit bat, also known as a flying fox, in Guam; two species of fish, including the San Marcos gambusia in Texas and Scioto madtom in Ohio, and eight species of mussels.
A large group of yellowfin tuna swimming off the coast of Italy. Like all fish, they sleep, but it's not like human sleep. Giordano Cipriani/The Image Bank via Getty Images Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com. Could you explain how fish sleep? Do they drift away on currents, or do they anchor themselves to a particular location when they sleep? – Laure and Neeraj, New York From the