Recently, a Saudi Press post was made on this forum stating that uromastyx had the unusual ability to absorb water. Here is a quote:
” If a drop of water is placed on the skin of a dhub or any uromastyx, the droplet will disappear at once. If it rains they absorb water. It is this sponge-like characteristic of some desert lizards that enable them to adapt well to deserts. “No one knows how they do that,” he said.
I took this as Wagemann hinting to the fact that uromastyx have hygroscopic abilities similar to that of a Thorny Devil.
I have not seen reference to uromastyx having this unique trait in any of my research nor did the water particles I dropped on the back of a dozen of my uromastyx instantly absorb. I just ended up with a lot of strange and confused looks from the uros.
If anyone has a lead, I would really like to get a hold of any material regarding the tail fat storage study that Wilms references in that article. Wilms states that uromastyx can convert fat to water at a 1 to 1.2 conversion rate. With specific numbers like this, I would think an actual study exists.
I would also like to know if Wagemann has knowledge of uromastyx actually demonstrating reliable hygroscopic abilities or if he simple drew his conclusions from dropping water on the back of a couple of animals.
I have emailed Mr Wilms but he is sometimes slow to respond, as he is an extremely busy man.
Although I have found no evidence of a uromastyx having a cloacal bursae similar to that of birds and turtles, I do think that uromastyx might be able to relax the vent enough when soaking to allow intake of water into this region. I have no proof of this- just a suspicion based on one particular experience. I do not regularly soak my uromastyx but on occasion have found the need (various reasons) to soak an animal. Several years ago I was soaking a large 500 gram male mali and when taking him back to his enclosure, he released a large amount of fluid void of feces and urates. I have been around reptiles my entire life so I know that this can be a typical stress response and have encountered it with tortoise, other uromastyx…ect. In this case, the amount of fluid was so exaggerated, it led me to the personal conclusion that this animal had somehow taken in a rather large amount of fluid through the vent region and released it half way back to the enclosure. I was quite amazed by the amount of fluid involved.
Should this action be a possibility, I have no guess on an animal’s ability to retain fluid in this area or how often it may occur with uromastyx when soaking. I have no idea where the fluid is stored but my guess would be the proctodeum? I am only relating one particular experience and my suspicions from this experience.
Artgecko wrote: ” My female who just laid eggs seemed to drink quite a bit of water when she had her soak.’
The majority of my females will drink water directly after oviposition. Even those females that typically do not drink water will often drink at this time. Next time I suggest you try offering standing water rather than soaking and see if the outcome is not the same. 