Yellow-billed caciques are large song birds. The body is completely black in both males and females. Males, however, have a more lustrous shine to their feathers than females. Both sexes also have a characteristic beak which is a whitish-yellow color. Their eyes are vibrant yellow as well. They are different from other caciques in the fact that they are the only ones who are open-nest builders. That is, they build an open-topped, cup–shaped nest in which to lay their eggs. They range in size from 56.7 to 70.9 g and from 21.6 to 25.4 cm in length, males are slightly larger than females.
Range mass: 56.7 to 70.9 g.
Range length: 21.6 to 25.4 cm.
Average wingspan: 23 cm.
Other Physical Features: endothermic ; homoiothermic; bilateral symmetry
Sexual Dimorphism: male larger; sexes colored or patterned differently; male more colorfulRights Holder
: The Regents of the University of Michigan and its licensorsBibliographic Citation
: Jordan, A. and G. Wallace 2010. "Amblycercus holosericeus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at Citation Link