I'm a TNR group and save information about all cats we help, anywhere from 1,000 to 1,500 each year. I also maintain a map of this information using Google Maps which allows us to see where folks are feeding in case there's situations in the future where we need to find out who is feeding nearby, folks who can keep an eye out for a lost cat, etc. The larger groups will call us for the map information as well if someone say brings in a feral cat that they can't adopt to see if anyone near that area recognizes the cat so they can release it on their property safely, other similar situations. It's incredibly helpful to have. In the data I collect I keep track of male/female, if they were s/n, if they were PTS due to disease (extremely helpful for monitoring colony health), which cats were friendly enough for adoption, rough age of cats (below 6 months, over 6 months, and senior over 10 years) as well as exactly which cats went back to the community.
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Jacqueline Betty
Charles River Alleycats
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