| dna hybridization evidence for the principal lineages of hummingbirds (aves:trochilidae). | the spectacular evolutionary radiation of hummingbirds (trochilidae) has served as a model system for many biological studies. to begin to provide a historical context for these investigations, we generated a complete matrix of dna hybridization distances among 26 hummingbirds and an outgroup swift (chaetura pelagica) to determine the principal hummingbird lineages. fitch topologies estimated from symmetrized delta tmh-c values and subjected to various validation methods (bootstrapping, weighted ... | 1997 | 9066799 |