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The number of expanded (blue) and contracted (red) gene families are shown along branches and nodes. MRCA, most recent common ancestor; Ain, bar-headed goose; Acy, swan goose; Nni, crested ibis; Apl, mallard; Gga, red junglefowl; Mga, turkey; Cca, common cuckoo; Cli, rock pigeon; Phu, ground tit; Cfl, bananaquit; Pma, great tit; Tgu, zebra finch; Ppu, ruff; Fpe, peregrine falcon; Bmu, yak; Pho, tibetan antelope.
