Over 200 snow urine samples were collected from Banks Island Peary caribou between March 1993 and May 1998. Most (n = 146) samples were collected during 3 time periods in 5 successive years: early winter (3 November-3 December). mid-winter (9 February-1 March). and late-winter (23 April-2 May). https://www.lightemupsequences.com/