Congratulations to Flavia Montaño-Centellas for her new paper with colleagues Lia Nahomi Kajiki, Giselle Mangini, Gabriel Colorado and María Elisa Fanjul that explores mixed-species bird flocks along elevational, latitudinal, and human disturbance gradients in the Neotropics.  This paper results from a special symposium entitled “Mixed-species flocks of birds: ecology and evolution” at the XII Ornithological Congress of the Americas at Puerto Iguazu in Argentina (8-11 August 2017).  After describing how mixed-species flocks respond to various gradients, their paper calls for studies to fill the gaps in knowledge, especially in subtropical forests, grasslands and shrublands, and for application of new technologies and analytical approaches to better understand behavior and interactions among flock members.  To access a pdf of this paper click here.