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). The ‘young survival model ’ is an extension of the Cormack-Jolly-Seber (CJS) model (which is discussed in detail in Chapters 1→7). The model contains two types of parameters, apparent survival (φ) and detection probability (p). Data for the CJS model consist of a string of ones and zeros indicating an individual animal is detected or not detected, whereas the data for the young survival model are a string of counts on young in a family group. Encounter histories are entered in the input file at the family group level rather than the individual young animal level. Despite this, it is important to note that the parameters refer to individual young animals not to the group in which they were detected. When there is only one young per family group, the young survival model reduces to the CJS model. The young survival model is based on extending the CJS model to all possible combinations of event
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