An unknown earplug in the Countrywide Museum of All-natural Background assortment. The sunshine and darkish levels originate from a Make up of keratin and lipids and can be employed to estimate whale age. (Megan Chen, NMNH) Baleen whales specialise in hearing small-frequency sounds for long-distance interaction. They don’t appear to https://barbarad950ddd7.onzeblog.com/profile