Fig. 2. Phylogeny of major hummingbird (Trochilidae) lineages in relation to mean interspecific values for lower and upper elevational distribution. The relationships of subfamilies and other groupings within the hummingbirds derive from analyses of Zusi and Bentz (Zusi and Bentz, 1995), Bleiweiss et al. (Bleiweiss et al., 1997) and Gerwin and Zink (Gerwin and Zink, 1998). Values for elevational distributions are from del Hoy et al. (del Hoy et al., 1999), as are data for the outgroup family Apodidae, the swifts.