3. Results
During 90 days of the three winters, we obtained a total of 200 effective video footages, which contained 1,086 minutes of 17,995 foraging activities (Table 3). Among these valid for-aging bouts, 84 were in shallow waters habitats and 116 were in deep waters. Of these foraging bouts, we observed 98 successful fishing events. A total of 163 fish were caught as there were occasions that a bird captured more than one in a single foraging bout.