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Polybia sp.
Some sort of wasps next, hanging from the underside of a leaf.
Taken with flash during a night walk through the rainforest/jungle beside the Braulio Carrillo National Park, Costa Rica.
Video with Polybia occidentalis nest from Costa Rica:
http://acp.eugraph.com/insects/polybia.h...
Vespidae, Polistinae, Polybia sp. A kind of social wasp which build their nest not with paper as Polistes sp. but with mud.
http://acp.eugraph.com/news/news06/odonn...
http://www.boldsystems.org/index.php/Tax...