Birds are important ecologically, but are in decline
worldwide, especially on islands (Sekercioglu et al.
2004). On continents evidence for adverse effects of ant
invasions on birds remains controversial and poorly documented
(Allen et al. 2004). On islands with low species
and functional redundancy (Denslow 2003) and the absence
of some functional groups (Whittaker et al. 1997),
invasive ants may have stronger effects. Some ant invasions
threaten entire island ecosystems. On the rainforest