chunk: At the story's start, Twinkle and Chubbins are lost in a "great forest." They encounter a "tuxix" — a creature that looks like a spiny turtle, but is in reality "a magician, a sorcerer, a wizard, and a witch all rolled into one...and you can imagine what a dreadful thing that would be." The evil tuxix casts a spell on the children, transforming them into little bird-like beings, with their own heads but the bodies of skylarks. (They resemble the human-headed, bird-bodied sirins, alkonosts, and gamayuns of Russian folklore.) Policeman Bluejay, the force of order in the avian world of the forest, leads the two child-larks on a flight through the sky; he esconces them in an abandoned thrush's nest in a maple tree, and with the help of a friendly eagle he retrieves their picnic basket (so that they don't have to eat bugs, worms, and grubs).