New #bioacoustics article at @journal-evo.bsky.social on how bird songs evolved extreme sound frequencies, despite frequency-dependent constraints on sound amplitude.
Paper here 📎: doi.org/10.1093/evol...

João Pacheco's new paper - doi.org/10.1016/j.an... - continues a story of fear, reputation, show-off and aggression in waxbills.
Here are all chapters:
doi.org/10.1016/j.an...
doi.org/10.1098/rspb...
doi.org/10.1093/behe...
doi.org/10.1016/j.an...
doi.org/10.1016/j.an...
doi.org/10.1111/eth....

A waxbill with its red bill mottled black. This happens in breeding females, who mottle their red bill with juvenile-like black. Perhaps breeding females exploit others' innate responses towards juvenile bill colour.

See the new article @asn-amnat.bsky.social here doi.org/10.1086/735832