The present tree is based on the relationships among families. A few families were not included in the figures in Sibley and Ahlquist, and thus are not included here as well. The branch lengths were calculated from the values of $\Delta T_{50}H$ as found in Sibley and Ahlquist (1990, figs. 354, 355, 356, and 369).
data(bird.families)
"phylo"
which
structure is described in the help page of the function
read.tree
.read.tree
, bird.orders
data(bird.families)
op <- par()
par(cex = 0.3)
plot(bird.families)
par(op)
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