The forked tail is bluish green and its outermost feathers are shafts with no vanes.

Its tail is rounded; the central feathers are green and the others cinnamon with a wide black band near the end.

[7] The white-bellied woodstar is found from the Central and Eastern Andes of Colombia south discontinuously through Ecuador and Peru into Bolivia as far as Cochabamba Department.

[7] The white-bellied woodstar is mainly sedentary though the records up to 4000 m suggest that it makes seasonal elevational movements.

[7] The white-bellied woodstar forages at all levels of vegetation, taking nectar from a variety of flowering plants and trees including Agave, Inga, and Lantana.

The white-bellied woodstar's calls include "a rather low-pitched 'djup' note and [a] higher-pitched dull 'chip'.