George J. F. Swan / June 2021 – vol. 114, issue 6, pp 351–353 Abstract Observations at a Common Buzzard Buteo buteo nest in Cornwall in 2015 helped to quantify the benefit of having a ‘helper’. The helper provisioned the chick with as many prey items as the male and female combined, although these were generally smaller, making its overall contribution comparable in terms of prey mass. These results suggest that breeding pairs with a helpe... This article is only available to registered users.To read more, please log in or purchase a subscription.