Fig. 4. Series of thermograms of the grey seal Laslo. (A) Thermogram recorded after 53 min. Thermal windows appear on the back of the head, the shoulder/neck region and the fore flipper. Thermal windows are clearly separated (see inset). (B) Thermogram recorded after 77 min. Thermal windows on the seal's body have enlarged and partly fused (Nos. 4, 5, 7; see also inset), while thermal windows on the right fore flipper remain comparatively cold. New thermal windows have just appeared on the seal's back (Nos. 8, 11). (C) Thermogram recorded after 89 min. Thermal windows on the seal's back have further enlarged and fused (Nos. 5, 7; see also inset), and thermal window 8 is fully developed.