The format is:
List of 8
$ CH : int [1:322, 1:18] 1 1 1 1 1 1 1 1 1 1 ...
capture histories of 322 individuals
$ I : int 322, number of individuals
$ K : int 18, capture occations (inclusive the first capture)
$ carez : num [1:322], covariate, intensity of care by the parents
$ year : num [1:322] index of year (4 years study)
$ agec : num [1:18] covariate age of the fledglings, centered
$ family: num [1:322] index of the family (group the individuals belong to)
$ nfam : num 72, number of families