Count the total number of days a nest was observed active and hence susceptible to
failure (“exposure” days). A nest can be included only if it was truly active (i.e., had at
least one egg). So, start counting exposure days on a nest located during building, for
example, when the first egg was laid. On a nest located with eggs or young, start
counting on find day. For nests whose outcome (fledge or fail) is known, stop counting
exposure days in between the last date observed active and the subsequent nest check.
For nests whose outcome is unknown, stop counting on the last active check. The most
precision you need is to the half day (see example below).