They are basically a Pygmy Mulga Monitor with a different pattern. They are classified as a different species, but they live in the same type of climate and habitat and have a continuous distribution and gene flow with Pygmy Mulgas. I can't imagine them being too much different.
The same could also be said about Diamond Pythons and Carpets(well the ones that live right next to diamonds anyway), one tends to thrive and the other has a habit of dying.
Except that the climates are very different. You could compare them to, say, Cape York Carpets vs Darwins. You don't get "Carpets" (as in, the type of thing you get further north, which is a hale and hardy captive) right next to the classic "Diamonds" (as in, the type which doesn't usually do well in captivity). As we all know, the Diamond/Carpet situation is an extreme example, one which people focus on because it is so unusual.
Yes, you can probably think further and come up with another exception, perhaps one which fits your argument perfectly, but we're silly if we base our assumptions on the exceptions rather than the rules. In any case, people have kept and bred caudolineatus in the same conditions you'd use for gilleni without any trouble. The only difference is that the caudolineatus are a little smaller and have smaller clutches. No need to confuse the situation by presenting the very rare exceptions as though they are typical.
It's shades of grey all the way between "absolute Diamond" and "absolute Carpet".
I don't know who the "competent keepers" were, but for a variety of reasons, "competent keepers" can have troubles. Steve Irwin is probably considered to have been a reasonably competent reptile keeper, but he used to have so much trouble with them that he swore under oath in court it was impossible to breed small monitors in captivity.
I sold Pygmy Mulga Monitors to some well known and respected reptile keepers, who quickly killed them by keeping them pythons (I suppose they thought they knew enough not to need my advice), and some complete newbies had great results by taking my advice and splurging on a $1 spotlight. Only a few years ago in Australia it was quite rare for anyone to manage to keep small monitors happy, and very few were ever bred. Less than 10 years ago we had a situation where a Pygmy Mulga Monitor was very difficult to get your hands on and if you did find one it was going to be wild caught and over a grand. When I first bred them it caused a bit of a stir and quite a few reptile keepers I had never heard of were on the phone to me asking how I had done it, even before I advertised any. They weren't interested in buying any, they were wanting to know how the heck I had managed to do it. After I published a couple of articles on the topic it became well known in Australia (before buying mine I saw that almost no one in Australia could do it, but I knew they were breeding like flies overseas, so I just asked what they were doing and copied). A few people in Australia were already quietly using the right methods at that stage, but no one had spoken up.
Chris
I would consider Danny Brown competent, wouldn't you ?
He also keeps Gillens and yet has had no problems with them. It makes one wonder, if indeed the two species really do have identical needs. Like I said previously, I suspect that Caudo's do not handle humidity as well as Gillen's.
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