Biologists measured 123 bird species and found that larger birds with wider beaks tend to be louder; Forest density and mating system don't correlate as much. The quietest are hummingbirds (64 dB) while the loudest are bare-throated bellbirds (122 dB)! 🧪
academic.oup.com/evolut/advan...
![The MOTHRA continuum-subtracted Hα image is shown with an inverted grey scale, emphasizing faint outer features. In the bright central regions a combined Hubble Space Telescope and Kitt Peak 4 m image is superposed on the MOTHRA data11. The Hubble Space Telescope image was generated from data in the Advanced Camera for Surveys F502N ([O iii]) and F658N (Hα) filters.
The arrow indicates the Gaia-determined direction of motion of the central white dwarf with respect to the ambient gas. The MOTHRA image shows many features at large (roughly greater than 1 pc) distances from the white dwarf that had not been detected in Hα before. The most striking of these are numerous bow shocks on the east side of the nebula, where AGB ejecta encounter the ambient ISM at supersonic relative velocities. Scale 5′ = 0.29 pc.
Credit: NASA, ESA, C. R. O’Dell (Vanderbilt University) and M. Meixner, P. McCullough and G. Bacon (Space Telescope Science Institute).](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:7grd7xlocvsiuj5pvbyp2jud/bafkreibvhgegsd6zgks7wncyvcktvk2fbs7j3orm47krtseluqhzliygve)
