LARGEST NEST HARVESTED

This is the largest nest in my BH. Everytime i do harvesting, i will leave this one untouched, because i want to observe its changes. After a year, i found out that because the nest is located on the corner of the plank, the swiftlet would increase the height of the nest by building on top of the original nest. I am therefore suggesting to all swiftlet lovers that they can leave a few nests untouched during harvesting in the future. These nests will act as samples for future observations. I believe this is the good way to understand swiftlets.