My dear Bioacoustics Fellows, We have received a few requests to postpone (for the second time) the deadlines for abstracts submission for the XXIV IBAC. After a discussion that involved all the organizing committee, we decided to postpone the abstract submission deadline to June 1st (23:59 Brasilia Time). This is also the limit date for the early fees. Despite we are satisfied with the number of submissions (we now 150 submitted abstracts from over 30 different countries), we still have room to comfortably accommodate more papers. We are working hard to make this edition of IBAC unforgettable, so that we decided not to lose any papers because of time restrictions. Still, it is not possible to postpone it again, so if you have missed the chance to submit you paper because of time, this is you last chance! We would like to thank all of you that have already submitted your papers, and call those who haven’t to done so. We also have postponed Jacques Vielliard travel grants, so graduate and undergraduate students that have not submitted their papers yet, still have time to apply for the grant. We sure hope to hold an outstanding meeting in Brazil, keeping up to previous last IBAC editions. With our best regards, Felipe Penin and XXIV IBAC Organizing Committee Organizing Committee