One way to do it is to fill the concave back part with Great Stuff, which will expand a lot. Let it dry, and then saw the entire back part level so you have a flat surface. This can be done with a serrated kitchen knife. Then you can use clear GE silicone I, made for windows and doors, or similar, to stick it to the glass. Just run a bead around the outside and cross a few beads in the middle and mash it against the glass. It will stick, but you may have to prop it until the silicone begins to cure. I just happen to like the texture and flow of the GE silicone I. You don't want to get the type made for caulking bathrooms. The other way is to attach the bark with the silicone around the edges and then stuff the concavity with something like sphagnum moss, or even tamp some substrate down into it. I have found this to be problematic when frogs, especially the small ones like imitators or shy ones, burrow into it out of sight or reach. It works well for the bolder and larger frogs, however.

I recommend the silicone method rather than other glues, because you CAN strip it off cleanly if you need to make changes, but it also adheres well.
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Patty
Pahsimeroi, Idaho

Dendrobates: auratus blue, auratus Ancon Hill, tinctorius azureus, leucomelas. Phyllobates: vittatus, terribilis, lugubris. Epipedobates: anthonyi tricolor pasaje. Ranitomeya fantastica, imitator, reticulata. Adelphobates castaneoticus, galactonotus. Oophagia pumilio Bastimentos. (updated systematic nomenclature)

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