Smaldon, R, Rabbits, B, Metcalfe, J. W. W, Ladhams, D. E, King, B & Scott, R. E / December 1976 – vol. 69, issue 12, pp 495–509 Diving rates of Great Northern Diver An adult Great Northern Diver Gavia immer was present at Chew Valley Lake, Avon, in November 1974, when the following observations, mainly concerning the bird's diving behaviour, were made. Preliminary observations had shown that it sometimes surfaced between dives for less than a second. Since precise timing of such frequent events with stopwatch and noteboo... This article is only available to registered users.To read more, please log in or purchase a subscription.