Bird peppers include a variety of peppers (Capsicum annum var. glabriusculum) which includes the wild forms native to the southern United States and Mexico south to Colombia.
Arbol
is a type of cayenne also known as the Chimayo and Thai or bird chile.
It is also known as japone when dried.
Very small, it is under an inch long, usually green and red, and very hot.
Some are slender, tubular, slightly curving pods and two to three inches long with pointed, upright pods that resemble the arbol in appearance and heat but distinguished from the arbol by its more solid walls.
Chiltepin
is one of the so-called “bird peppers”. The Nahuatl name means flea-chile because it is very small and packs a sharp bite.