The article „Honesty in signalling games is maintained by trade-offs rather than costs” by Szabolcs Számadó, István Zachar, Dániel Czégel and Dustin J. Penn has been published in BMC Biology. Science Journalist Amy McDermott recommend it online on the website of PNAS.

Available here: https://www.pnas.org/post/journal-club/peacock-s-tail-and-other-flashy-ornaments-don-t-have-come-cost