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. 2012 Jul 5;367(1597):1811–1828. doi: 10.1098/rstb.2011.0215

Figure 2.

Figure 2.

The phylogeny of signal complexity in (a) closely related birds, (b) distantly related birds and (c) ants. Strong phylogenetic inertia was estimated for the repertoires of both bird groups, while virtually no phylogenetic inertia was found for the pheromones of ants.