The Margaretta’s hermit is a longbilled hummingbird. The average bill length is 37 millimeters (mm) (1.5 in) and the average tail length is 42 mm (1.7 in) (Hinkelmann 1996, pp. 122–123). The Margaretta’s hermit historically occurred in coastal forested habitats from Penambuco to Espı´rito Santo, Brazil (del Hoyo et al. 1999, p. 543; Hinkelmann 1996, pp. 132–135; Sibley and Monroe 1990, p. 143). The last confirmed occurrence of the Margaretta’s hermit is from a relatively old (ca. 1978) sighting of the subspecies on a privately-owned, remnant forest called Klabin Farm, which is located in Espı´rito Santo which presently includes 40 km2 (15.46 mi2) of land (ICBP 1981, p. 2). A portion of this area (ca. 15 km2 (5.79 mi2)) was designated as the Co´rrego Grande Biological Reserve in 1989 (Costa 2007, p. 20; Willis and Oniki 2002, p. 21). Margaretta’s hermit likely also occurred at the Sooretama Biological Reserve in Espı´rito Santo until around 1977 (ICBP 1981, p. 2).