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Cormorants  259































             Figure 15.5  Fish school followed by assist-feeding, while obscuring the human form with costume.
             Source: photo courtesy of International Bird Rescue.

                2000



              Body weight (g) 1500



                1000


                500


                  0
                   0     5    10   15    20   25    30   35    40   45   50
                                         Days from hatch
             Figure 15.6  Weight gain of three Double-crested Cormorants. Source: data courtesy of International Bird
             Rescue.

               Housing

             All housing should be cleaned every day, in some cases before feeding or exams, to remove large
             quantities of feces and any leftover food. Nests need to be cleaned frequently, up to four times/day,
             while the incubator itself needs to be cleaned and disinfected at least once daily. Birds should be
             removed from enclosures during cleaning, which provides an opportune time for weighing, exam-
             ining, and administering nutritional supplements. If their housing is not yet ready after their exam,
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