Fig. 2. Series of thermograms of the harp seal Jamie. Thermal windows are numbered from cranial to caudal and according to order of their appearance. (A) Arrangement of thermograms recorded after 19 min and 20 min. The first thermal windows on the seal's trunk have appeared on the right dorsal body side. Thermal windows are solitary and of more or less circular shape, and no fusion of thermal windows has occurred yet. The hind flippers show low surface temperatures. A temperature profile line (inset) reveals a sharp decrease in surface temperature between thermal windows 1 and 2. (B) Arrangement of thermograms recorded after 30 min and 31 min. Thermal windows on the right dorsal side of the seal's trunk have enlarged and partly fused (Nos. 1–3 and Nos. 4, 5; see also temperature profile line in inset), and new thermal windows have appeared (Nos. 6–10). (C) Arrangement of thermograms recorded after 51 min and 53 min. Thermal windows have further enlarged and fused to coherent areas (Nos. 1, 2, 3, 7, 8, 9, 10 and Nos. 4, 5, respectively; see also inset), and a new thermal window has just appeared (No. 11). Note that, at this time, hind flippers show high surface temperatures as well (No. 12).