Figure 2.

(a and b) are reproduced from Will et al. (2014), illustrating the lack of temporal patterns in the presence of corticosterone in both plasma (a) and primary feathers (b) in birds raised on a control diet (light gray) throughout the nestling period. (c) Schematic of feather growth patterns during rhinoceros auklet nestling development. Back and breast feathers emerge between day 8 and 11 and finish growing at day 24 to 28 posthatch. Primary feathers emerge at day 11 and complete growth between days 42 and 49. Tail feathers emerge at day 20 and finish growing sometime after fledging (after day 56), but for captive raised birds tail feather growth was terminated between days 42 and 48 (as illustrated above). Feathers are grown from tip (earliest) to base (latest)