European Shag. Birds of Heaven # 0001. Green Eyes The birds are the face of freedom. Its flight represents everything that humans long for, full and absolute freedom. This collection of birds is built in Solana Blockchain, each bird is provably unique and different each other. The whole collection is composed by five rarity levels attending the color of the eyes of each bird. Black Eyes are Common, red eyes are uncommon, yellow eyes are rare, blue eyes are epic and the only one green eye is legendary.