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Barnack Hills & Holes

Here we provide all the information we have for each transect site.

For example, clicking on one of the section titles below will display the site description (shown automatically), as well as a list of the species recorded here, and their yearly counts. However, you can also chose to Show All the sections, or even Hide All, if you so wish.

Map of Barnack Hills & Holes

The map shows you the route that this butterfly transect follows.


County : England(Cambridgeshire)
Gridref : TF070040
Year established : 1981
Number of sections : 10
Altitude (m) :
Length (m) : 1669
Width (m) : -1
Broad habitat : Dry semi/unimproved (flower rich) chalk/limestone grassland
The following species have been recorded on this site:
SpeciesStatusColonised / ExtinctMean Count 
Small SkipperStable 7.92 more
Essex Skipper? 0.46 more
Large SkipperStable 7.52 more
Dingy SkipperStable 0.34 more
Clouded Yellow? 0.19 more
BrimstoneIncreasing 18.31 more
Large WhiteStable 29.79 more
Small WhiteDeclining 66.76 more
Green-veined WhiteStable 33.22 more
Orange-tipIncreasing 11.59 more
Green HairstreakIncreasing 2.05 more
Purple HairstreakStable 0.21 more
Small CopperStable 6.90 more
Brown ArgusIncreasing 3.43 more
Common BlueDeclining 51.68 more
Chalk Hill BlueIncreasing 4.06 more
Holly BlueStable 5.33 more
Painted LadyStable 2.12 more
Small TortoiseshellDeclining 29.68 more
PeacockStable 28.95 more
CommaIncreasing 5.32 more
Silver-washed Fritillary? 0.57 more
Speckled WoodIncreasing 18.76 more
WallDeclining 1.93 more
Marbled WhiteIncreasing 56.47 more
GatekeeperDeclining 198.25 more
Meadow BrownDeclining 646.84 more
Small HeathDeclining 70.46 more
RingletStable 125.36 more

This table shows the species that have been recorded on this site. Where sufficient data is available, trends in abundance are assessed and colonisation/extinction events are identified. Click on 'more' to see a plot of abundance through time for each species. See green question mark above for more details.


The UKBMS is run by  Butterfly Conservation (BC), the Centre for Ecology and Hydrology (CEH) and the British Trust for Ornithology (BTO), in partnership with the Joint Nature Conservation Committee (JNCC), and supported and steered by Forestry Commission (FC),  Natural England (NE), Natural Resources Wales (NRW), Northern Ireland Environment Agency (NIEA), and Scottish Natural Heritage (SNH). The UKBMS is indebted to all volunteers who contribute data to the scheme.