article_snippet.sent: Llallawavis scagliai (shown in the reconstruction above) would have had powerful jaws but limited hearing .
article_snippet.sent: Llallawavis scagliai (shown in the reconstruction above) was so well preserved that scientists have been able to study part of the bird's auditory system and the bird trachae.
article_snippet.sent: This seems to indicate that Llallawavis may have had a narrow, low vocalization frequency range, presumably used for intraspecific acoustic communication or prey detection.'
article_snippet.sent: Scientists used 3D scanning of the long skull of Llallawavis scagliai (above) to examine its hearing ability .
article_snippet.sent: the researchers found that Llallawavis would have had an average hearing range of around 3,800Hz and a sensitivity of around 2,300Hz.
article_snippet.sent: The human ear, by contrast, can detect sounds with frequencies between 20Hz and 20,000Hz, but is best at around 4,000-5,000Hz.
article_snippet.sent: This suggests that Llallawavis would have been better at detecting lower frequency sounds than humans are.
article_snippet.sent: However, based on the hearing frequencies that we know that terror birds were able to hear, it is possible to state that Llallawavis may have produced sound of low frequency.'
article_snippet.sent: So, we are able to state how much developed were some of the jaw muscles in Llallawavis. '