Mexican woodnymph

The Mexican woodnymph (Eupherusa ridgwayi) is a species of hummingbird in the family Trochilidae endemic to western Mexico. It lives in subtropical or tropical moist lowland/foothill forest and plantations, feeding on flower nectar and insects. Mexican woodnymphs are vulnerable, threatened by habitat loss through deforestation.

Mexican woodnymphs are small birds, generally 9–10 centimetres (3.5–3.9 in) long. Females weigh around 3.5 grams (0.12 oz) and males weigh from 3.5 to 4.2 grams (0.12 to 0.15 oz). Males have a straight black bill, mostly green body, a dull green chest, a blue-black forked tail, and an indigo crown. Females are similar, mostly green with darker green tail and wings, a light gray chest. They lack the characteristic indigo crown, instead have a white spot behind their eyes and green disks on the sides of their chest.

One known vocalization consists of an irregular series of 2–4 quick notes. Their call has been described as a "liquid rattle".