Aiming to recreate the animals ‘from the inside’, Marc made himself so complete a master of their anatomy that he felt qualified to teach classes on the subject, though in the end there were few takers. This anatomical knowledge gave him the ability to improvise. From this point on, Marc did not aim to merely copy nature, but to capture the spirit of nature and of ‘animal life’.
~FROM https://www.gseart.com/artist/franz-marc/bio

1. Katze mit Jungen, 1900-1916 / Tempera, oil, pencil on cardboard / Kunstmuseum Moritzburg, Halle, Germany

2. Sketch, 1908 / Crayon on paper / Private collection

3. Two Horses, 1908-09 / Bronze / Lenbachhaus München, Germany

4. Yellow Cow, 1911 / Oil on canvas / Solomon R. Guggenheim Museum, NYC

5. Tierlegende (Animal Legend), 1912 / Woodcut on Japanese paper / Various locations

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Franz Marc~
https://en.wikipedia.org/wiki/Franz_Marc

Why Did Franz Marc Paint Animals?
https://www.thecollector.com/why-did-franz-marc-paint-animals/
Franz Marc and the animalization of art
https://smarthistory.org/franz-marc-animal-art/