This chapter - written by Paul Lukacs and Vicky Dreitz (Colordao Division of Wildlife). The first paragraph of the chapter (below) will give you a better idea of this particular model:
The survival probability of juvenile animals is often of interest, but juvenile animals may be difficult to mark or marking may impact survival. In such cases, a count of the young animals with an attending adult may be the only data that can be obtained. If the adult is marked and highly detectable (such as with a radio transmitter), then survival of individual young can be estimated from the counts of young in a family group. This chapter describes the MARK implementation of the ‘Young Survival from Marked Adults’ model developed in Lukacs et al. (2004).
As noted, this chapter should be considered very late beta. Feedback posted here would be helpful. Eventually, the chapter will be indexed and collated in with the rest of the book.