Yes, though the most valuable numbers here are not on the scale. Mourning geckos are tiny, quick, and almost entirely female, reproducing by parthenogenesis, so a modest group quietly becomes a colony. A log that tracks head counts, eggs, hatching, appetite, and the condition of the group will serve you better than frequent weights on animals that weigh about as much as a coin.
Why colony records matter more than individual weights
Each new hatchling is a genetic copy of its mother, and eggs are glued in pairs to leaves, cork, or glass, often in spots you only find by looking. Without dated notes, owners lose track of how many geckos they actually have, which matters for space, feeding stations, and spotting whether juveniles are competing successfully with adults. A gecko this small also declines quickly, and in a group the first sign is often a head-count discrepancy or a juvenile that has stopped appearing at the diet cup.
Regular entries turn the vivarium from a pleasant blur of movement into a population you understand, including roughly how many eggs are incubating at any moment.
What a useful mourning gecko entry contains
Count visible geckos at a consistent time, ideally during evening activity, and record the number without treating a single low count as alarming, since some will be hidden. Note egg locations and dates when you spot new pairs, hatch events, and any deaths, which are important data rather than failures to hide. Record feeding: how quickly prepared diet is taken, whether fruit flies or tiny crickets are hunted eagerly, and whether extra feeding stations were needed as numbers rose.
Weighing is occasional and opportunistic, using a small container when a gecko is already being moved, for instance during a rehouse. Note body condition visually instead: tails should carry a little reserve, and hip bones should not show sharply on adults.
Signs the colony log should flag
A run of entries showing unhatched eggs well past the usual span, hatchlings that fail to appear at food, adults thinning despite full diet cups, or fighting damage as density climbs all deserve attention. So does a sudden drop in your regular count that repeats across several evenings, which can mean escape through a surprisingly small gap, a real risk with a gecko this size.
Environmental notes belong beside these: temperature and humidity shifts, a misting system change, or a new plant that altered egg-laying sites. If several animals decline together, an amphibian and reptile veterinarian will want exactly that shared timeline, and your colony log provides it in order.
Records that keep pace with the colony
Review the log monthly and reconcile it against the enclosure: expected juveniles, eggs still incubating, feeding stations per animal. That short review is what stops a charming group from becoming an overcrowded one, and it informs honest decisions about moving youngsters to a second vivarium or to new keepers.
When geckos do move on, their history should move with them, and KinsLe's Pet Passport lets you keep the colony's records in one portable packet, so a group transfer includes laying and feeding history rather than a guess.