报告

作者

日期

eBird记录 S287726804

地点

Patriot's Point -- nature trail and surrounding areas
Charleston, South Carolina, United States
该地点产生的媒体文件 配图名录
地图
地图 坐标: 32.7912107, -79.9011505
年龄和性别
年龄性别未知 - 1
发声
飞行鸣叫
回放
未说明

媒体文件注释

Flight call slowed to 0.070x normal rate.

观察细节

Call at 3 seconds and again at 28.5 s. Response sounds in plastic stage not as polished. A complex flight/contact call heard many times by several individuals. A lyrical, buzzy and lengthy call. Call begins with quick frequency modulation (buzz) I believe there perhaps is evidence of nonlinear phenomena (irregularities in the vibration of vocal folds in syrinx) that can cause the sound to be rough...maybe showing as bi-phonation (two independent voices, polyphony...vocal folds that are not synchronized and are vibrating at two different frequencies) and side banding/subharmonics. The 2nd audio is the same call slowed to 0.070 x and makes it easier for us to hear the frequency modulations and complexity of this flight call.

技术信息

录音机
话筒
附件
原始文件大小
1.57 MB