In a desert world inhabited by anthropomorphic birds, the Cuckoo is a pilgrim fascinated by the sun. An inopportunely laid egg is perceived by her as a hindrance. You can habitually get rid of an egg, but suddenly a chick hatches from it.
Kukuschka is a bird, who follows the sun. It seems to her as if she already could touch It, but the Sun is still far away. Suddenly she is not alone anymore, but for two it's even more difficult to keep going so fast. She will reach the Sun, may be tomorrow may be the day after.