. Il campo Canadese-naturalista. 1974 Hatler e Darling: La balena grigia in British Columbia 453 l'isola di Vancouver. Oceano Pacifico Miglia 0 mammifero marino giro percorso in figura 2. Osservazioni delle balene grigie in prossimità della baia di Wickaninnish, Isola di Vancouver, British Columbia, in tempi diversi rispetto durante la migrazione. Cerchi chiusi rappresentano punti approssimativi in cui le balene grigie sono stati visti più di una volta, mentre cerchi vuoti indicano i singoli avvistamenti. I tre avvistamenti in Grice Bay (indicata con a, b e c) sono state effettuate su 27, 28, e 29 ottobre 1971 rispettivamente. Aree puntinata indica mudfla marea

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. The Canadian field-naturalist. 1974 Hatler and Darling: The Gray Whale in British Columbia 453 VANCOUVER ISLAND. PACIFIC OCEAN Miles 0 Sea Mammal Tour Route Figure 2. Observations of gray whales in the vicinity of Wickaninnish Bay, Vancouver Island, British Columbia, at times other than during migration. Closed circles represent approximate locations at which gray whales have been seen more than once, while open circles indicate single sightings. The three sightings in Grice Bay (labelled a, b, and c) were made on 27, 28, and 29 October 1971 respectively. Stippled areas indicate tidal mudflats (inside waters) and sand beaches (exposed waters). The entire area shown is indicated by a cross-hatched rectangle on Figure 1. Our most intensive series of observations was recorded in summer 1972 when the junior author operated a commercial cruise boat for Pacific Rim Expeditions, Ltd. This firm's sea-mammal obser- vation tours, run daily as weather permitted, covered an approximately 3-mile stretch of water between the north end of Wickaninnish Bay and Sea Lion Rocks (see Figure 2), and whales were seen only when they occurred on or near this route. From one to perhaps seven gray whales were seen each day of operation (29 June through 4 September) except on 14 and 24 August and 4 September. On these 3 days when no whales were seen, less than the full day of cruises was run owing to adverse weather conditions. The maximum count of six or seven (depending upon possible duplication) was obtained on 6 July; on 27 other days during which counts were possible numbers seen occurred in the following frequen- cies: one whale (5), two (2), three (8), four (5), five (6), six (1). In 1973 our observations were again sporadic, but were sufficient to show that gray whales were present in the Wickaninnish Bay vicinity throughout the summer. Sightings of gray whales were a regular feature of nature walks conducted by park naturalists, and there were few days on which no whales were seen.

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