remember that in the field, lizards have burrows and retreats that they go to. they spend most of their time underground, or in protected areas.
lizards bask to obtain body heat needs. basking exposes an animal to predation, it is a dangerous activity. they want to bask, achieve temp needs quickly, then get back to safety (hidespots).
in soil burrows, temps are MUCH lower than daytime air temps and basking temps, and humidity is much higher. this is where they spend a lot of time.
in a "typical" pet store style setup, a glass tank with an open screen top, there is no burrow, no retreat to a higher humidity environment. we are not talking about a moist, wet, or condensation-on-the-walls setup, just more moisture than is usually given. consider that even a desert lizard's bio makeup is MOSTLY water : )
they do drink in a cage, but that is to help offset the moisture lost in the beef jerky machine that is a tank with a screen top (with a hot heat source shooting into it).
an ideal setup has a temp gradient, but also a moisture gradient. many setups are nearly bone dry, and that is detrimental to the animals in the long run.
when you limit venting, such as covering a screen top, you are containing most of the cage heat, along with moisture. that means lower wattage bulbs, and temperature needs that are easier to achieve : )
a chronically dehydrated lizard won't necessarily die in a short period. but over the long term, they suffer organ failure and gout, among other issues, from the chronic state of dehydration.
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robyn@proexotics.com
Pro Exotics Reptiles
