Female Fledgling MARK Data.rda

ch: capture history for each individual from 1975-2017. 0 indicates not captured, 1 indicates captured AgeAtFirstSight: age of individual when first captures, HY=nestling, SY=1-yr old, ASY=older female Sex: F if known to be female, U if captured only as nestling age: age when captured for the first time, 0 if nestling, 1 if 1-yr old, 2 if older *note: only half of all fledglings that never returned subsequently have been included--the other half have been assumed to be male该数据集涵盖1975年至2017年间每只个体的捕获历史（capture history）：其中0代表未被捕获，1代表已被捕获。 AgeAtFirstSight：个体首次被捕获时的年龄，其中HY代表雏鸟（nestling），SY代表1岁龄个体，ASY代表成年雌性个体。 Sex：若经确认该个体为雌性，则标注为F；仅作为雏鸟捕获的个体标注为U。 age：个体首次被捕获时的年龄，雏鸟记为0，1岁龄个体记为1，成年个体记为2。 *注：未后续返回的离巢幼鸟（fledglings）中仅半数被纳入本数据集，剩余半数被假设为雄性。