Fig. 5. (a) Mean number of predators and attacks per hour for each 4-h observation period at low tide (on foraging sites) and 2-h observation period at high tide (on roosting sites) on sites in the upper Bay of Fundy. (b) Mean number of predators and attacks per hour at low tide on a per sandpiper basis in the same areas. Error bars are ± 1 SE. Statistical comparisons reported in the text do not include Minas Basin data.