3 \title{Phylogeny of the Orders of Birds From Sibley and Ahlquist}
5 This data set describes the phylogenetic relationships of the orders
6 of birds as reported by Sibley and Ahlquist (1990). Sibley and
7 Ahlquist inferred this phylogeny from an extensive number of DNA/DNA
8 hybridization experiments. The ``tapestry'' reported by these two
9 authors (more than 1000 species out of the ca. 9000 extant bird
10 species) generated a lot of debates.
12 The present tree is based on the relationships among orders. The
13 branch lengths were calculated from the values of \eqn{\Delta
14 T_{50}H}{Delta T50H} as found in Sibley and Ahlquist (1990,
21 The data are stored as an object of class \code{"phylo"} which
22 structure is described in the help page of the function
23 \code{\link{read.tree}}.
26 Sibley, C. G. and Ahlquist, J. E. (1990) Phylogeny and classification
27 of birds: a study in molecular evolution. New Haven: Yale University Press.
30 \code{\link{read.tree}}, \code{\link{bird.families}}