Figure 2.

Predictions from the Cox proportional hazard model for age at recruitment of male kittiwakes in relation to their social status during development (A- versus B-chicks) and experimental treatment at recruitment. Kittiwakes recruited earlier in fed nests (A-chicks, solid line with filled squares; B-chicks, solid line with unfilled squares) than in unfed nests (A-chicks, dashed line with filled triangles; B-chicks, dashed line with unfilled triangles). Within treatments at recruitment, B-chicks recruited earlier than A-chicks.