Keeping records for mourning geckos means bookkeeping for a colony, not an individual. This tiny species is all-female and reproduces without mating, so a pair of geckos becomes a group, and the group becomes a crowd, on a schedule written in eggs. Your log tracks clutches, hatchlings, headcounts, and the enclosure checks that keep very small geckos from slipping out into the house.
Counting a colony that grows itself
Mourning geckos glue their eggs in pairs to leaves, cork, and corners, often in a favorite communal spot. Record each new clutch you find, where it is and roughly when it appeared, and note hatch dates when empty, papery shells turn up. Keep a running headcount, even an approximate one split between adults and juveniles, and update it when you move youngsters to a grow-out enclosure. That count is not trivia: it tells you when the colony has outgrown its home, when to set up a second enclosure, and what numbers you are offering other keepers when you rehome surplus geckos. If you run more than one colony, note which enclosure each group lives in, so the counts never blur together.
Feeding and misting notes
Log the feeding rhythm rather than individual meals: prepared gecko diet offered on its rotation, and the days you add tiny live foods such as fruit flies or pinhead crickets, which matter most for hatchlings and juveniles. Note calcium dusting of the insects, and at feeding time watch whether the smallest geckos are getting access or being shouldered aside by adults; a note like that is the trigger for an extra feeding station. Record misting times and any change to the schedule, since humidity supports both shedding and egg development, and jot down enclosure temperatures after any equipment change.
Record arrivals and departures too. New mourning geckos are best quarantined in a simple separate enclosure first, and a short log of that period, feeding well, droppings normal, no mites seen, is the evidence that they are safe to join the colony. Note every gecko rehomed out, with the date and who took them, and any found dead with its likely age group; across a self-replacing colony, those plain entries are the only family tree the group will ever have.
Escape-proofing and health checks
Mourning geckos are small enough to leave through gaps other geckos cannot use, so keep a short checklist in the log: door seams, cable holes, and vent mesh inspected whenever the enclosure is opened for deep cleaning, with any fix recorded. Note escapes honestly, where the gecko was found and how it likely got out, because that is the record that actually seals the next gap. Watch for tail losses, skinny juveniles at the bottom of the pecking order, and any gecko sitting listless on the enclosure floor; contact a vet if several geckos decline at once, which points at the environment rather than the individual. KinsLe's Pet Passport can hold the colony's egg log, headcounts, and enclosure notes together, so the whole group's story stays straight as it grows.