With special postmark, commemorating the 25th anniversary of WWF.
The bird pictured on the stamps is the European bee-eater (Merops apiaster): http://www.birdlife.org/datazone/species/index.html?action=SpcHTMDetails.asp&sid=1181&m=0
The bird pictured on the stamps is the European bee-eater (Merops apiaster): http://www.birdlife.org/datazone/species/index.html?action=SpcHTMDetails.asp&sid=1181&m=0