Kittiwake growth trajectories

Choose a chick to compare observed weight-at-age points with the growth trajectory predicted by the best Middleton weight-growth model.

Best model: von Bertalanffy weight-growth model, W_t = W_∞(1 - e^-k(t-t₀))³, with individual growth trajectories (estimated as random effects), W_∞ varying by feeding treatment and cohort, and k varying by cohort.