Unambiguous Evidence of Helping at the Nest in Bridled Titmice

摘要

Two instances of helping behavior in Bridled Titmice (Baeolophus wollweberi) were ob- Served. 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 ef- Forts 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).