[1] The Nun is one of the oldest breeds and was originally a flying tumbler before being developed for exhibition.

[3] Continental Europe previously referred to the Nun as the Dutch Shell Pigeon during the early part of the 20th century.

The beak should be straight but stout, and the eyes a pearly white.

[10] Charles Darwin referred to the Nun in The Variation of Animals and Plants Under Domestication, where he described how the Nun and Jacobin breeds of pigeon have evolved to have less caudal vertebrae than the rock pigeon, from which they originate.

The American Pigeon Journal devoted an entire special issue for the breed.