Saving England's most threatened species from extinction

Veteran Trees and Their Importance to Bats

Veteran trees and their importance to bats

Veteran trees are impressive natural structures of great age and biological importance and this abstract from an 1876 diary entry by The Reverend Francis Kilvert highlights the age and magnificence of our veteran trees:

“those grey old men of Moccas, those grey, gnarled, low-browed, knock-kneed, bowed, bent, huge, strange, long-armed, deformed, hunchbacked misshapen oak men that stand awaiting and watching century after century biding God’s time with both feet in the grave and yet tiring down and seeing out generation after generation.” 

Normally associated with woodland pastures and parkland, veteran trees can also be found along boundary banks, in hedgerows, along river corridors and in woodlands. Over their lifespan, these veteran trees will have supported an impressive range of wildlife from plants, lichen, fungi, to insects, birds, reptiles, amphibians and mammals including our only true flying mammal, the bat.


Brown Long-eared bat

Bats also need shelter known as a roost, to raise their young, hibernate through the winter months and protect themselves from predators and the weather. Natural features in trees (trunk cavities, hollows, rot holes, bark crevices, cracks, fissures, split beams, lifted bark plates, knot holes, basal cavities, split branches and Woodpecker holes), formed by decay, damage and age can provide these roosts, which our woodland bats rely on, and any tree (even young specimens) can support these features. However an older tree will have had more time to develop and showcase these features, and therefore will provide more roost opportunities.


Noctule bat

What bats will use however will depend on the species and the seasons. For example, some of our woodland specialist like the rare Bechstein’s bat, and our biggest bat, the Noctule will favour woodpecker holes, while the Barbastelle utilises crevices in split branches and cavities behind lifted, flaky bark plates. In the summer, female bats will be rearing their young and require features high up in a tree that are warm and safe. Meanwhile in the winter, bats like the Barbastelle, Noctule and the Bechstein’s bat will be hibernating so they will need features that go deep inside the tree, where the temperature is cool and stable and they can sleep undisturbed through the cold winter months.


Bechstein's bat

In the UK our bats are small, furry creatures of the night moving through the landscape in search for food, feeding on insects like midges, flies, moths and beetles. We are lucky enough to have 18 species of bats in the UK and trees play an important role in supporting the large variety of insects that they feed on. The older the tree is, particularly if it is a native tree, the greater abundance of insects it will support. This is where those ‘grey old men’ come into their own! As they become a fixture in the landscape, they will provide a variety of microhabitats as well as habitat continuity, therefore supporting a wide range of insects and wildlife.

So when you next come across a ‘grey old man’, take a pause and study its old gnarled, twisted branches. Appreciate its importance to our wildlife (those cracks, holes and crevices are likely to be a home) and wonder at the changes it has experienced over the years.

 

Sonia Reveley

Bat Conservation Trust

 

(c) Bat Photos - Hugh Clark, Bat Conservation Trust

 

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  • Why not volunteer for Back from the Brink? Check out our events page for opportunities near you.
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1 thought on “Veteran Trees and Their Importance to Bats

  1. I am sure I see Bats flying around our garden in the time before day becomes night. Just as it is starting to get dark. It’s the way they fly. Like fighter jets flying around for fun. Our neighbours garden is full of trees and some are huge conker trees. But there’s a big variety of different trees too. & in ours and in our other neighbours garden. The three houses providing home for all sorts. We get those small birds that never come out of the sky. I think they called Swifts or Swillets. & many sparrows & Robins, blackbirds and crows, jack daws, Jays and woodpeckers, Even have a bird of pray occasionally. East Sussex

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