West European hedgehog (Erinaceus europaeus) records in Great Britain from PTES' 'Living with Mammals' (2003-2024) and 'Mammals on Roads' (2001-2013)

Each file contains data from a separate citizen science survey managed by PTES, either 'Living with mammals' (LwM) or 'Mammals on Roads' (MoR).

LwM: observations of western Eurpean hedgehog at sites within the built environment (predominantly domestic gardens) from sightings or field signs, collected from 2003 to 2024. Data identify location and date of observations; total observation time for year x site combination; percentage surface cover of vegetation types; and site features that are present.

Field details:

usi!: uniquely identifies survey sitesite!year!: survey yearseason!: spring, autumn, other

From 2003 to 2019 inclusive, observations were recorded in a single 13-week period starting on the Monday closest to 01 April. Weeks run Monday to Sunday (corresponding to ‘spring’). In 2020,observations were recorded in two 13-week periods, the first starting on Monday 30 March (‘spring’), and the second, on Monday 31 August (‘autumn’). From Monday 29 March 2021, constraints on when data were collected were removed (i.e., records could be submitted for any week). Since then, the survey has run throughout the year.

ndawn: number of weeks with observation effort at dawnnday: number of weeks with observation effort during the dayndusk: number of weeks with observation effort at dusknnight: number of weeks with observation effort during the night

‘Dawn’ is defined as one hour before or after sunrise; ‘day’, as one hour after sunrise to one hour before sunset; ‘dusk’, as one hour before sunset to one hour after sunset; ‘night’, as one hour after sunset to one hour before sunrise.

Nall: total number of weeks with observation effortsumDawn: total observation effort at dawn (minutes)sumDay: total observation effort at day (minutes)sumDusk: total observation effort at dusk (minutes)sumNight: total observation effort at night (minutes)

For each period (e.g., dawn, day, etc.), observation time was recorded as one of five categories: less than a minute; 1-10 minutes; 11-30 minutes; 31-60 minutes; and 60+ minutes. To sum effort across weeks, the mid-value of these categories was used.

nshhog: number of weeks with hedgehog signsnwhhog: number of weeks with hedgehog sightings (maximum counts)sumhhog: sum of weekly maximum counts grass!: percentage cover of the survey site that is grassshrub!: percentage cover of the survey site that is shrubstree!: percentage cover of the survey site that is treesconc!: percentage cover of the survey site that is concrete/gravel/pavingshed!: percentage cover of the survey site that is shed/hut/buildingflow!: percentage cover of the survey site that is flowerbed/cultivatedwild!: percentage cover of the survey site that is untended/’wild’siteshed: presence of a shed on the sitesitepond: presence of a pond on the sitesitebat: presence of a bat roost box on the sitesitehhog: presence of a hedgehog nest box on the sitesitebird: presence of a bird nest box on the sitesitecomp: presence of a compost pile on the sitesitepile: presence of a wood pile on the sitesitebtab: presence of a bird table on the sitesitebbath: presence of a bird bath on the sitesitbfeed: presence of a bird feeder on the sitesiteofeed: presence of a other feeder on the sitesiteoriver: presence of a water course on the site

MoR: observations of western Eurpean hedgehog casualties recorded on road journeys from 2001 to 2013. Data identify location and date; distance surveyed; end- and start locations of journey; number of hedgehogs; and survey platform (paper-based or digital).

Field details:

journey : uniquely identifies a record;date: journey date;miles: journey distance (mi);north: British National Grid northing value of journey start point;east: British National Grid easting value of journey start point;endnorth: British National Grid northing value of journey endpoint;endeast: British National Grid easting value of journey endpointn_hedgehog: number of hedgehogs recorded;source: paper; phone (mobile device); online (webpage) year: journey year