Wildlife Imagery in Churches

Have you ever wondered why holly, ivy and mistletoe feature particularly at Christmas?
Why vine, grapes and wheat are the most common plants portrayed and why is yew planted in many churchyards?
Do you know where to find a green mole, a six-legged spider and a blue frog with white patterns on its body? In which church can you see moths and butterflies and where might you find a Jewel Beetle?
What are the reasons for carving a preaching fox or for painting two apes disembowelling a pig? Why are lions sometimes found carved on the stonework doorways of older...