Nineteen-Day Fast to be the one foretold by the Báb, accepted the fast, but altered many of its details and regulations. The Bahá'í fast resembles fasting practices of several other religions. Lent is a period of fasting for Christians, Yom Kippur and many other holidays for Jews, and the fast of Ramadan is practiced by Muslims. The Bahá'í fasting most resembles the fast of Ramadan, except that the period of fasting is defined as a fixed Bahá'í month, whereas Muslims fast during a lunar month, whose specific Gregorian dates vary from year to year. Bahá'u'lláh established the guidelines of the fast in
Thomas's fruit-eating bat cytochrome b data that showed it nested within "watsoni". The IUCN has followed this recommendation. Solari "et al." (2009) described it as the subspecies "D. w. incomitata". They stated that "The paraphyly and specific status of watsoni/incomitata is not easily resolved" and suggested that nuclear DNA sequence comparisons would be useful. The only morphological distinction between the island and mainland populations noted was differences in the cusps of the lower molars, while the DNA sequence divergence of 3.6% is less than typical for sister species in the genus. Thomas's fruit-eating bat Thomas's fruit-eating bat ("Dermanura watsoni"), sometimes also popularly called