The Cien­aga de Zap­a­ta, or the Zap­a­ta Swamp as it is affec­tion­ate­ly known, is a UNESCO Bios­phere Reserve, home to approx­i­mate­ly 150 dif­fer­ent species of birds, includ­ing water­hens, par­rots, and heron. Croc­o­diles are also com­mon.