Doppelband: EQUALITY & Gleichberechtigung:: Also birds are modern. & Auch Vögel sind fortschrittlich

Blurb: TWO IN ONE: Why the male canary had to let its feathers go. How come that permanent waves appear in tail feathers? What do you have to do when you find "pink chewing gums”? Klappentext: DOPPELBAND: Warum das Kanarienvogelmännchen Federn lassen mußte. Was Dauerwellen in Schwanzfedern zu suchen haben. Was man macht, wenn man rosa Kaugummis findet.