Pear tree, birch, barberry picture book

This book by Alois Carigiet tells the story of Dumeni Tubak, his wife Nesa and their children Viturin and Babetin.
It tells of Krog and Krah, the crows in the pear tree, as well as of Blaufrack and Diebsack, the magpies in the top of the birch.
Particularly noteworthy, however, is the story of Zizi and Zizewi, a pair of warblers who built their nest in the thorny branches of the barberry bush.