An unknown earplug with the National Museum of Organic Record collection. The light and darkish layers come from a Develop up of keratin and lipids and can be utilized to estimate whale age. (Megan Chen, NMNH) Baleen whales focus on Listening to minimal-frequency sounds for prolonged-length conversation. Cuvier’s beaked whales https://tariqe062ghg8.elbloglibre.com/profile