An unidentified earplug within the Countrywide Museum of All-natural Background assortment. The light and dark levels originate from a Make up of keratin and lipids and may be used to estimate whale age. (Megan Chen, NMNH) Baleen whales concentrate on hearing reduced-frequency Appears for very long-length communication. Whales will be https://antoniox863rag2.wikijm.com/user