Figure 1.

(a) Growth trajectories of the 113 kittiwake chicks that developed in supplementally fed or control (unfed) nests and later recruited into the breeding colony; (b) locally weighted linear regression of body mass on age of fed (solid line), unfed (dashed line), male (dotted line) and female (dash-dotted line) chicks. Rate of increase in body mass during the linear phase was higher for chicks growing in fed nests and for males.