We have experienced some losses, some missing chicks, some damaged eggs, some chicks have been found dead in the nest. We do our best to deter predation with baffles, smaller house openings and careful monitoring, but despite our best efforts, their are always owls, snakes and unfortunately invasive species like house sparrows that can get the martins.
Currently we check the nests every 2 days to get as accurate hatch date on each nest. There is a small window in which the state DEEP can band the chicks, they have to be old enough to band, but not old enough to fledge early, so between 10 and 22 days old. Currently we have 55 birds ready to be banded in Guilford and 130 in total at Hammonasset. The state licensed banders come in as a team, they age the birds according to photos, they weigh them and put both a federal band and a state and colony band on them. As part of the landlord experience you are invited to come observe this process and sometimes get to help out. The state sets the date with us, cool or rainy weather postpones plans since the babies are so vulnerable to temperature.