Rabbit blowing a horn. Among the marginal creatures populating medieval manuscripts musical animals are fairly common.
"Even if two scribes knew how make the same letters, it is possible that they would turn out differently"(N. Oresme)
William Morris Illustrated Manuscript - The Story of the Dwellers at Eyr - Birmingham Museums & Art Gallery
This is beyond bizarre - from the Luttrell Psalter, anonymous medieval manuscript known for its scenes of daily life and otherworldly beings.
"The Rutland Psalter", c1260
Royal 10 E IV, f. 3, Mermaid and merman
Dragon initial from a Book of Hours made in the Netherlands or Germany, c.1463-76 (source).
From the Medieval #Manuscripts blog post 'Medieval Maps of the Holy Land'. Image: The Acre map of Matthew Paris
theodore mayerne’s experiments with pigments, from ‘pictoria, sculptoria et quae subalternarum artium’ - england 1620-1646
Medieval Cat -- Lutrell Psalter, f°190r (detail), 1320-1340 "It knows I'm only playing"