The slaty flowerpiercer (Diglossa plumbea) is a passerine bird endemic to the Talamancan montane forests.

This is a common bird in mountain forest canopy and edges, and especially in sunlit clearings and areas with flowering shrubs, which can include gardens.

The lower altitudinal limit of its breeding range increases from 1200 m in the north of Costa Rica to 1900 m in the southern mountains.

The large cup nest, built by the female, is made of coarse plant material and lined with fine fibres.

As its name implies, the slaty flowerpiercer pierces the base of the flowers of shrubs and epiphytes with its bill and extracts the nectar through the hole with a brush-like tongue.