Jaculus
The jaculus is a flying snake that hides in trees; when an animal walks beneath, the jaculus drops down on it.
The image was obtained from the source listed below.
Koninklijke Bibliotheek - Medieval Illuminated Manuscripts
Manuscript
Koninklijke Bibliotheek, KB, KA 16 (Der Naturen Bloeme), folio 124v
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Koninklijke Bibliotheek - Medieval Illuminated Manuscripts