If your UVB bulb is more than nine months old, write its install date on the side in pencil. If you cannot find an install date, replace it this week.
MBD: the silent failure mode.
Metabolic bone disease is the most common preventable death in captive chameleons. Calcium, UVB, and basking temperature conspire — or fail to.
MBD presents in stages. Early: subtle leg tremors when climbing, slight casque irregularity in juveniles. Mid: rubber jaw, soft mandible, reluctance to bite feeders. Late: pathologic fractures, paralysis. The early stage is the only stage where reversal is straightforward.
Three failures usually combine. Insufficient calcium from a thin gutload. Insufficient UVB from coil bulbs, expired bulbs, or twelve-month-plus replacement intervals. Insufficient basking temperature, which suppresses metabolism and reduces D3 photosynthesis.
Fix all three at once. Calcium dust at every meal. Replace the UVB bulb on the calendar, not on visual inspection. Verify basking surface temperature with a probe — air temperature is not basking temperature.
DSQUARED Reptiles — Living Art. Curated Genetics.
From the field notes archive.
Reading early gular edema before it becomes a vet visit.
Soft swelling under the throat can mean three different things. Two resolve at home. One needs an ARAV-listed reptile vet within the week.
The egg-laying bin: substrate, depth, timing.
Gravid females need an egg-laying bin from the day you suspect they are gravid, not the day they start digging. Dystocia is a vet emergency.
Heat stress in summer cages.
Ambient room temperature creeps in summer. The basking lamp does not know the room got hotter. Together they push juveniles into heat stress.