A number of studies on the feeding behaviour of sucking predators have estimated the weight of biomass the predator extracts from the prey by measuring the weight change occurring in the prey. This method does not consider that a proportion of the prey weight change is lost to the immediate environment. I examined the spider Diaea sp. feeding on the fruit fly Drosophila immigrans and found that the prey lost approximately 28% more weight than the predator gained. This difference was largely explained by water loss from the prey. My results suggest that water loss, which is not available to the predator, is an important part of prey weight loss. To avoid overestimating predator biomass gain it is necessary to measure the predator weight gain directly or take into account water loss as a component of prey weight change.
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