To add to that - often, people do TOO much, and kill their animals
accidentally. Too much heat, too much food, too much
supplementation. Perhaps the biggest killer - too much intervention in
general!
From speaking to dozens and dozens of keepers, the biggest killer of
chameleons is MBD brought on by ignorance. People read a care
sheet, and come away with the "knowledge" that a UV bulb prevents
MBD, or that any "cricket dust" will do. Too often, I see people using
UV bulbs that are no more than reptile basking bulbs, that produce NO
UVB. Or equally as bad - brand name UVB bulbs that are next to
worthless. The next thing is calcium powders with little or no D3, and
more phosphorus than Calcium. People just don't know the specifics.
That's why my veiled caresheet is 20 pages long - I cover every detail of
everything - the do's and the don'ts. I don't just tell them what to do,
and what not to do - but the reasonings behind it.
For the people that have "everything right", the average lifespan is still
much shorter than it should be. From polling them, I'm convinced
they're ALL overfeeding their animals to the point of premature death.
Almost every calyptratus I see in person, or online, has bulging
casques. Everyone I run into and question is concerned when their
chameleon eats "only" 2 or 3 crickets a day. The norm is 10-20 insects
PER DAY. My big male maintains weight on 6-10 insects PER
WEEK, plus fruit, flowers and veggies. The fact that people are almost
competing to see who has the biggest chameleon doesn't help, either. I
see it in snakes. A reticulated python should not have the same basic
body proportions as a green anaconda - not even close! The "giant
snakes" that pose for pictures at reptile shows die very young. They
should be living decades, not just 12-15 years.
A friend of mine bought a huge adult male parsonii at a wholesaler, for
$50. He kept it in his pet store for a few months, in a small wooden
cage, with a screen front. It was about 3x2x2'. He'd let it climb around
on some large pieces of wood during the day, and it got plenty of
water. During this time, I performed fecal checks on it, and treated it
for nematodes and protozoans.
He sold it to a woman for $200 - cage included. She had no reptile
experience, but just really liked it. She kept it in the cage at night, and
let him climb around the plants in her living room during the day. It was
alive and doing well when we left NJ, about 3 years later. It was able to
just hang out on the trees, looking out the windows. Neat, huh?