COMPREHENSIVE studies have been made of the grazing behaviour of cattle in countries with a temperate climate, and the literature on the subject has been ably summarized by Johnstone-Wallace and Kennedy1, Tribe2, and Worden3. There are, however, no references in the literature to similar studies in the tropics; and information available on the behaviour of cattle in a hot climate, recently reviewed by Findlay4, has been derived from daytime observations or the very short-term investigation of Seath and Miller5, who studied the grazing behaviour of six dairy cows for five consecutive twenty-four hour periods.