An unidentified earplug through the Countrywide Museum of Purely natural Background collection. The light and dark layers come from a Develop up of keratin and lipids and can be utilized to estimate whale age. (Megan Chen, NMNH) Baleen whales specialize in Listening to very low-frequency Seems for prolonged-distance communication. Other https://pierrep406qqr2.nico-wiki.com/user