Abstract
Diurnal rhythm and activity pattern of Peregrine Falcon Falco peregrinus was studied in UAE from 2001 to 2003 in large enclosures, wherein they showed regular movement and the median distance travelled in a day was 50-75m. They preterred to forage in the morning than in the evening. The daily activity (68%) started from 0530-0630hr and they roosted between 1730-1830hr (47%) The major part of their daily activity involved in foragine followed by resting. The males were parochial about roosting sites and during the breeding season they made a variety of calls, which attracted and stimulated the females for courtship display preceded by mating. The vocalization also helped them maintain territories.