Spagnum moss (not sure if this is the same as reindeer moss?) Holds an astonishing amount of water and i use this in my crestie set up as well as my rainbow boa damp hide. Take aaaaages to dry out and i have it scattered around my cresties floor or you could even tuck it in amongst the branches high up if you wanted to as it won't drip providing you haven't drenched it

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Promoting Quality Care Of Boas & Various Geckos
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Artisan Reptiles - Facebook
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Lover & keeper of Boa Constrictor - Morphs/Commons/Dwarfs/BCI/BCC/BCA
plus
various Day, Satanic Leaftailed, Leachianus, other Gecko species
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Western Hognose among other beautiful creatures!