Small decorative swallow breed of domestic pigeons from Bohemia. Distinguished by a very light, graceful build, strongly pronounced "swallow" silhouette, elongated narrow wings, and characteristic coloration: entirely white body + colored flight feathers ("colored wings"). Weight 240–310 g (ideal 260–280 g), body length 190–230 mm, wingspan 480–530 mm. Head small and rounded (38–42 mm), eyes large dark brown (9–11 mm), beak thin (18–21 mm), neck long and slender (55–65 mm). Wings very long (180–205 mm), extending 25–40 mm beyond the tail. Tail short (65–75 mm). Legs short (tarsus 28–34 mm), fully feathered with white "trousers". Plumage dense, smooth, silky. Classic variants: black-winged, red-winged, yellow-winged, blue-winged. Differs from the base type and other swallow breeds by smaller size, longer pointed wings, short tail, fully feathered tarsi, and pure white body without pattern.