Image: London planetrees tower over the jungle gym at the Playground of the Americas My most recent collaboration with ioby was the successful fundraising campaign for a mobile map of the trees and other wild things in Washington Square Park also known as Washington Square Park Ecology . A couple of years ago, I was invited by the organization to write a local ecology series for the organization's blog. We decided on tree guides to five playgrounds in downtown Manhattan. Naturally, a guide for Washington Square Park was the first installment! Learn about the Trees in Tot Playground in Washington Square Park . The remaining four guides are the Trees of the Playground of the Americas , the Trees of Minetta Playground , the Trees of the Playground at Pier 25 , and the Trees of Evelyn’s Playground in Union Square Park. Do you have a favorite treed playground? Let us know in the comments. This post has been edited. It was originally published on June 25, 2012.