Graphical depiction of the statistical model.

<p>Graphical model depicting the dependency structure. We have observation models for the visual health parameters <i>H</i>, for survey effort <i>E</i>, and for sightings <i>Y</i> (top panel). The middle panel comprises two process models for the latent states of health <i>h</i>, and movement, <i>z</i>. Lastly, survival, <i>s</i>, is estimated as a function of latent health and movement.