Last Glacial Maximum led to community-wide population expansion in a montane songbird radiation in highland Papua New Guinea.

"availability of data and materials the ddrad-seq data (sequence read archive: srp158801) and coi gene sequences (mk507157-mk507229) generated in this study are available on ncbi. availability of data and materials the ddrad-seq data (sequence read archive: srp158801"

"Competing interests The authors declare no competing interests."

"Funding FER acknowledges a Singapore Ministry of Education Tier II grant (WBS R-154-000-A59–112) for financial support. BC acknowledges support by two SEABIG grants (WBS R-154-000-648-646 and WBS R-154-000-648-733). KS and BK acknowledge the Grant agency of the Czech Republic (GACR No. 18-23794Y). The funding bodies had no role in the design of the study, nor in the collection, analysis and interpretation of data and in the writing of the manuscript."