The black-billed streamertail (Trochilus scitulus) is a species of hummingbird in the Trochilidae family. It is endemic to eastern Jamaica. It is sometimes considered a subspecies of Trochilus polytmus.
Hummingbirds drink nectar, a sweet liquid inside certain flowers. Like bees, they are able to assess the amount of sugar in the nectar they eat; they normally reject flower types that produce nectar that is less than 10% sugar and prefer those whose sugar content is higher. Nectar is a mixture of glucose, fructose, and sucrose, and is a poor source of nutrients, so hummingbirds meet their needs for protein, amino acids, vitamins, minerals, etc. by preying on insects and spiders.
(Brewster & Bangs, 1901)