Bibliography : Hedgehog
| Maurice Burton | The Hedgehog and the Apples |
| Anne Clark | Beasts and Bawdy |
| Arthur H. Collins | Symbolism of Animals and Birds Represented in English Church Architecture |
| Michael J. Curley | Physiologus |
| Stavros Lazaris | Le dialogue entre l’image et le texte dans le Physiologus de Sofia (Dujcev gr. 297) : le cas de l’echidna |
| Willy Ley | Dawn of Zoology |
| John Mason Neale | Mediæval preachers and mediæval preaching: A series of extracts, translated from the sermons of the middle ages, chronologically arranged; with notes and an introduction |
| Ann Payne | Medieval Beasts |