More than 100 marsh crocodiles (Crocodylus palustris) reside at Manghopir tank next to the shrine of the 13th-century Sufi saint Pir Mangho, also known as Sufi Sakhi Sultan, located in in Gadap Town, one of the oldest districts of Karachi. Pilgrims who pay their respects at this place of worship also come to offer sacrificial food to these revered animals who are said to be the disciples of Pir Mangho himself. Outside of the sacred precincts marsh crocodiles are all but extinct in Pakistan. Various stories seek to explain the legendary spiritual attachment of these tame crocodiles to the patron saint. According to the caretaker of the crocodiles, Khalifa Sajjad, they are thought to have been carried as lice within the hair of the saint and miraculously transformed into crocodiles when dropped into the pond. Fed by healing sulphur pools formed by hot-water springs, the water of the crocodile tank has curative properties that attracts patients with skin diseases, who bath in the adjacent bathing facilities.