Fig. 1
From: A field guide for aging passerine nestlings using growth data and predictive modeling
Initial mass (a), tarsus (b), and culmen (c) measurements collected from nestlings for 0–21 days of age. For final models, mass (a) and tarsus (b) were analyzed from 0 to 10 days because variation increased after day 10 and predictive power of models was reduced. Culmen (c) was analyzed from 0 to 15 days because variation increased after day 15 for 2015 and data was not collected passed day 15 in 2017. Red dashed lines show the age below which data were used for model development. In all three panels, points are jittered to see the spread of the data