Figure 2. Aspects of the field study of lateralization in belugas.

(A) Observation area in front of the observation tower is marked, but not restricted to the red elipse. (B) Characteristic markings on the body of a characteristic female used for individual identification marked with red arrows (from left to right: carvings, indent on the dorsal fin, scratches of different colour). (C) A young calf swimming with the mother in the view of underwater video camera. (D) A young calf rolling along the axis to the right of the mother. Red spiral arrow shows the direction of rolling.