Another cool result is that the gene CYP2J19, coding for red v. yellow forecrown, supports the species tree, while surrounding regions support an 'introgressed' topology. It also shows a deeper divergence between Red-fronted taxa, further supporting a single ancient origin the red coloration. (9/10)

We studied RADseq markers across two hybrid zones and found that, although geographic clines tended to be narrow, markers in regions supporting putative 'introgressed' topologies followed wider clines. This supports that contemporary gene flow indeed contributes to gene-tree heterogeneity. (8/10)

When inferring a phylogeny using only regions of the genome with very low recombination rate (and low introgression rate), we recovered another topology where Red-fronted tinkerbirds are monophyletic. We believe this best represents the species tree of this group. (6/10)

We found that this topology was over-represented in regions of the genome with a high recombination rate, which also show increased introgression rate. It is then likely that this topology reflects introgression. (5/10)

However, we also found substantial variation in phylogenetic signal across the genome. The aforementionned topology, although being the most common, is only supported by ~15% of the genome. (4/10)

When building a phylogeny using whole-genome data, we recovered a fully-supported topology where Red- and Yellow-fronted lineages are not reciprocally monophyletic. (3/10)

We studied Red- and Yellow-fronted Tinkerbirds, which form several hybrid zones across Africa. (2/10)