There has been a recent sighting and photo of Rhinoceros Beetle on this Blog. The link below should therefore be of interest as it mentions this beetle and the preferred habitats of other beetles. It also links at the bottom of the article to really good info about "Invertebrates and Ancient Trees".
It may seem a little odd to our modern perception of what makes a woodland but dare it be admitted we have got it all wrong. Could closed canopy woodland (everywhere) be perhaps a sign of serious degredation of both trees and habitat?
Is planting more of these woodlands the answer? If not, why are we doing so?
Read here: http://www.ancienttreeforum.co.uk/saproxylic-beetles-in-capability-brown-landscapes-and-the-importance-of-continuity/