Unambiguous Evidence of Helping at the Nest in Bridled Titmice

Two instances of helping behavior in Bridled Titmice (Baeolophus wollweberi) were observed. In each case, one auxiliary bird assisted in feeding chicks at a nest. Both helpers were male; one a hatching year bird and the other an after hatching year bird. It was possible to quantify the feeding efforts of all three birds at one nest, but not at the other. The importance of our findings lies in the rarity of helping behavior in the titmouse family (Paridae).