It is a job that requires both carefulness and patience, as volunteers and experts put on rings on birds' legs and examined them at the end of August.
They were working for the Sandwich Bay Bird Observatory (SBBOT).
The SBBOT is an accredited bird observatory, monitoring and recording species at the Sandwich Bay reserve, including birds, mammals and insects, notably moths.
The Information gathered while bird ringing including age, weight and sex is passed on to the British Trust for Ornithology, BTO which helps monitor long-term population and global migration patterns.
This information is vital for wider conservation efforts.