A worldwide community photographing and learning about wildlife
Argiope savignyi
An orb-web spider, looks like an Araneidae of the genus Argiope
Mangrove swamp in the Cahuita National Park, Costa Rica
I am so glad I have never seen anything like that in person! I have a ridiculous fear of spiders! (but if I did see it I still would have taken a picture of this fascinating creature)
There is this mission. Not as specific as you suggested, but it's a nice one to browse.
http://www.projectnoah.org/missions/8082...