The museum is now offering pre-opening guided tours at 3.00pm Monday to Saturday. See http://biomuseopanama.org/en/mondongo-tour The official opening will be later this year but note that now and then you will only be able to see half of the exhibition areas, The rest (aquaria etc) will open at a much later date. The exhibits on the formation of the isthmus and on exchange of species are very good but in surprisingly small spaces considering the overall size of the building. Mixed feelings about the building itself; semi-open which is great in the dry season but may prove to be very uncomfortable in the wet. They should probably have ignored the wildly impractical, expensive and difficult Gehry design, used one of the many existing unoccupied Canal area buildings and put all the resources into the exhibits! If so, the museum would have opened long ago.
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