They aren't from Madigascar, but South America. According to my information, they occupy a large geographical range (E. trivittatus) that extends from Peru, Ecuador and Colombia across Brazil to the lowlands of the Guyanas.
Here's what Schmidt and Henkel's Poison Dart Frogs (Professional Breeders Series) has to say about their requirements: As a result of their size and their ability to perform very long leaps these frogs require genuinely large terraria. Wild-caught specimens are infamous for their panicked attempts to escape - that usually end up abruptly at the next glass wall. In order to prevent this from happening, the rear and sides walls must be covered with sheets of cork or another solid material that is then planted over. A few vines or similar objects complete the artificial biotype. The temperatures should range at 24-26 degreesC during the day and decrease to room values at night. Misting the entire terrarium at least twice ever day maintains the required high level of relative humidity. There's more on breeding and feeding.
This seems to be a nice, but limited little booklet you can find at Serpent's Tale/Zoo Sales. Tel. 507-467-8733 It's a chimaira publication.
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Patty
Pahsimeroi, Idaho
4 D. auratus blue
5 D. galactonotus pumpkin orange splash back
5 D. imitator
6 D. leucomelas
4 D. pumilio Bastimentos
4 D. fantasticus
4 P. terribilis
4 D. reticulatus
4 D. castaneoticus