"The concept of avian milk (Ancient Greek: ὀρνίθων γάλα, ornithon gala) stretches back to ancient Greece. Aristophanes uses "the milk of the birds" in the plays The Birds and The Wasps as a proverbial rarity. The expression is also found in Strabo's Geographica where the island of Samos is described as a blest country to which those who praise it do not hesitate to apply the proverb that "it produces even bird's milk" (φέρει καί ὀρνίθων γάλα). A similar expression lac gallinaceum (Latin for "chicken's milk") was also later used by Petronius (38.1) and Pliny the Elder (Plin. Nat. pr. 24) as a term for a great rarity. The idiom became later common in many languages and appeared in Slavic folk tales. In one such tale the beautiful princess tests the ardor and resourcefulness of her suitor by sending him out into the wilderness to find and bring back the one fantastical luxury she does not have: bird's milk. In the fairy tale Little Hare by Aleksey Remizov (who wrote many imitations of traditional Slavic folk tales) the magic bird Gagana produces milk."