Grimmelshausen - Simplicissimus Cover page with "Baldanders" 
This fabulous beast seems to be a hybrid between a devil (horns on his head & one hoofed leg) and a bird-fish-siren or a bird-fish-triton respectively.
It is called "Bald-anders" which means "Soon-changed".
Hans Jakob Christoffel von Grimmelshausen
Cover page of Der abenteuerliche Simplicissimus teutsch
Herzog August Bibliothek Wolfenbüttel