Spot a Hog is a citizen science study that aims to test the potential of using data obtained from privately owned camera traps for monitoring hedgehogs and estimating their density. It will be using a novel method that requires a calibration step, for the study team to be able to extract the metrics necessary for the population size modeling. The West European Hedgehog is a species of conservation concern in the UK, as its population has been undergoing a historic decline. To identify the reasons for, and the extent of, this decline data from across the country is needed.
Camera traps, or trail cameras, are widely applied in wildlife monitoring. Some amazing initiatives, such as the National Hedgehog Monitoring Programme, uses camera traps to estimate the density of various species. However, camera traps are also increasingly used by private users to observe wildlife in their gardens. This data holds great potential for monitoring urban species, as it can provide information on multiple species in a habitat often not represented in scientific studies. This is also an especially important habitat for hedgehogs, as currently they are more frequently observed in urban than in rural areas.
The novel method used in this study requires some additional steps to work out how animals move in front of the camera, and that’s where you come in!
The study welcomes anyone who already has a camera trap (or will get one before the start of the survey) in May 2025. You will need to set up your camera according to a protocol available on the website, calibrate the camera following the instructions, and leave it on for a maximum of 1 month. After this, you will need to upload the images to a designated project on MammalWeb. The images will then be available to the public for spotting (i.e. classifying images by species) and the results will be analysed by the project team.
Further information can be found on the Spot a Hog website as well as how to sign up. You can also download an information sheet.