In Europe Muscat Euroferret is an effective search engine. You are European based, so perhaps you can help me. A woman in my bible class recently visited Europe and noticed that the protestant churches have a rooster on them. My first impression was that it is based on Peter's denial and more in general our denial of Jesus too often. In a library I found a German lexicon with a comprehensive description.
Church fathers are very interested in the cock.
Set on top of the cross on a church, it a rooster means the symbol of the victory of Christ. Dutch books have other interesting information. First the cock was a symbol of light, later it became a symbol of the light of mercy. The power of the night demons stops when the cock crows. For this reason Early Church fathers used the cock as symbol of resurrection.