A variety of bats frequent The Heath.
The noctule bat (Nyctalus noctula)
One of the largest bats found in Britain, and is often the first to emerge from its roost, sometimes before sunset.
Weighing some 18 to 40 grams and with a wingspan of 32 to 40cm it has a sleek golden coloured fur and broad brown ears.
Although still a fairly widespread species in London, the noctule seems to have declined in recent years.
This is possibly due at least in part to over management of trees where it exclusively roosts in woodpecker or rot holes.
The noctule feeds on moths, beetles and mayflies and typically feeds high over woodland, parkland and water bodies.
The Daubenton's bat (Myotis daubentonii)
The Daubenton's bat is a medium sized bat weighing 7 to 12 grams and with a wing span of 24 to 27cm.
It was often called the water bat in the past because of its distinctive habit of flying in a level flight about 10cm above the surface of water bodies such as lakes.
The Daubenton's feeds on small flies such as caddis flies and midges and roosts in trees or tunnels and bridges which are generally near water.
Natterer's bat (Myotis natteren)
Natterer's bat (Myotis nattereri) is a European bat with pale wings. It has brown fur, also seen on the leg wing membrane, tending to white on its underside. It is found across most of the continent, but is considered scarce..
In summer they roost in deciduous and coniferous trees, buildings or bat boxes close to their feeding habitats.
They are a protected species.
Common Pipistrelle bat (Pipistrellis pipistrellus)
Common Pipistrelles are small bats with dark skin and fur with a bare face.
They have a light, fluttery flight pattern and like to hunt midges along the tops of hedges in gardens and around street lights.
They are crevice bats and squeeze themselves into tight spaces such as inside a cavity wall.