Schwagmeyer, P. L.; Mock, Douglas W.; Parker, Geoffrey A. - In: Behavioral Ecology 13 (2002) 5, pp. 713-721
We explored the responses of monogamous house sparrow parents to deviations in their mates' contributions to nestling provisioning. Following 1-2 days of baseline measurement of parental food delivery rates, we applied small lead fishing weights to the tail feathers of either male or female...