An unidentified earplug from your National Museum of All-natural Background assortment. The light and dark layers originate from a Establish up of keratin and lipids and can be used to estimate whale age. (Megan Chen, NMNH) Baleen whales specialize in Listening to low-frequency Appears for very long-length communication. The species’ https://genghisw516qpn1.blogitright.com/profile