White-bellied tyrannulet
The white-bellied tyrannulet is a small species of bird in the family Tyrannidae. It breeds in the Andes of Bolivia and northern Argentina ; it migrates as far east as Uruguay. It is found in open forest, woodland and various open habitats with scattered trees. It is closely related to, and by several authorities considered a subspecies of the white-crested tyrannulet, which has a yellow belly. There is complete intergradation between them in belly color and they do not seem to differ vocally. Another yellow-bellied and on average shorter-tailed, vocally distinct species, the Straneck's tyrannulet, was for a period mistakenly referred to by the scientific name Serpophaga griseiceps, but that name is a junior synonym of Serpophaga munda.
