Experiments show that hummingbirds suffer few energy costs when they grow long tails.

ABSTRACT.-We sequenced 912 bp of the cytochrome-b gene to examine phylogenetic relationships of the enigmatic Saw-billed Hermit (Ramphodon naevius), a large and distinctive hummingbird endemic to tropical forests of southeastern Brazil.

By RANDOLPH E. SCHMID WASHINGTON (AP) -- Hummingbirds and the flowers they feed on - and pollenate - have changed together in an evolutionary dance.