Plain-capped Starthroat

The plain-capped starthroat has three subspecies, the nominate H. c. constantii, H. c. pinicola, and H. c. leocadiae.

Subspecies H. c. pinicola is the northernmost; it is found in Mexico from Sonora south to Jalisco. H. c. leocadiae is found in southwestern Mexico and western Guatemala. The nominate H. c. constantii is found from El Salvador through Honduras and Nicaragua into northwestern Costa Rica. H. c. pinicola also strays to Arizona, where it was first recorded in 1969 and by 2022 was being seen almost annually. The species inhabits a variety of arid to semiarid landscapes including the interior and edges of mature forest, thorn forest, scrublands, gallery forest, secondary forest, and open areas with scattered trees.

===Movement=== The plain-capped starthroat is a year-round resident in most of its range. In Sonora it appears to be mostly a breeding-season inhabitant but there are a few winter records as well. In Arizona almost all of the records are between May and October.

The plain-capped starthroat feeds on nectar from a wide variety of flowering plants. It usually forages by trap-lining (visiting a circuit of flowers) but males sometimes defend flower patches. It forages at all heights from the understory to the forest canopy. In addition to nectar, it also feeds on small insects captured by hawking from an exposed perch and by gleaning from vegetation.

Little is known about the plain-capped starthroat's breeding phenology. In western Mexico it breeds between January and June and in Costa Rica between October and January, but its breeding seasons elsewhere have not been documented. It makes a shallow cup nest of plant down with lichen on the outside and typically places it near the tip of a branch high in a tree.

The plain-capped starthroat's song is "a series of sharp chips interspersed with varied chips, chip chip chip pi-chip chip chip ...., or chi chi chi chi whit-it chi ...". Its calls include "a high-pitched, fairly soft and melodious slurred tseep or cheek", "a sharp, fairly loud peek", and during chases "a high pitched, piercing twitter".

The IUCN has assessed the plain-capped starthroat as being of Least Concern. It has a very large range and its population is estimated to be between 50,000 and 500,000 mature individuals. The population is, however, believed to be decreasing. No immediate threats have been identified. It ranges from uncommon to common in various parts of its range. "Human activity probably has little short term effect on [the] Plain-capped Starthroat".