GCA Forestry UK Limited

• Our thermal drone  surveys deliver accurate, evidence-based wildlife population assessments across a range of habitats.  We conduct surveys for a variety of species, including deer, wild boar, feral goats, birds and squirrels. By utilising high-resolution thermal imaging technology and scientifically robust survey methodologies, we are able to collect reliable data while minimising disturbance to wildlife. All survey results are supported by verifiable evidence, including thermal imagery, mapping outputs, and detailed reporting, ensuring transparency and confidence in the data collected.

• Understanding wildlife populations is only one aspect of effective land and habitat management. Our Herbivore Impact Assessments evaluate the effects of browsing, grazing, and other herbivore pressures on woodland, forestry, and sensitive habitats. These assessments not only provide an estimate of deer abundance within a given area but also measure the extent and severity of vegetation impacts over time. By examining browsing damage, regeneration success, species composition, and habitat condition, we can identify signs of ecological imbalance and provide evidence-based recommendations to support sustainable wildlife and habitat management.

• All surveys are conducted using recognised scientific methodologies, ensuring that the data collected is accurate, repeatable, and suitable for informing management decisions. Detailed reports include population estimates, spatial analysis, photographic evidence, and management recommendations tailored to the objectives of each project. Our aim is to provide clients with reliable, scientifically robust data that supports effective conservation, biodiversity enhancement, sustainable land management, and informed decision-making. 

A wildlife census is a systematic survey used to estimate the size, distribution, and composition of a wildlife population within a defined area. In the case of wild deer, a census aims to provide an accurate assessment of deer numbers while recording important information such as species, sex, age class, location, and group size.

Traditionally, deer censuses have been conducted from the ground using binoculars, spotting scopes, and, more recently, handheld thermal imaging devices. This approach requires multiple surveyors positioned across a site, recording the time, location, species, and sex of each observed herd. For example, a sighting may be recorded as 10 females and 2 males within a particular area.

While effective in some situations, ground-based censuses are labour-intensive, time-consuming, and require significant human resources to achieve comprehensive coverage, particularly across large landscapes.

For many years, aerial surveys using helicopters have also been employed, particularly in large, open environments such as those found in the Scottish Highlands. Although helicopter surveys can cover vast areas quickly, they are expensive to operate and can place considerable stress on resident deer populations due to noise and disturbance. Furthermore, helicopter surveys are often impractical or ineffective in the woodland, fragmented, and semi-urban landscapes that characterise much of the United Kingdom.

Advances in drone technology have transformed the way wildlife censuses are conducted. Equipped with high-resolution thermal imaging and optical cameras, modern drones can detect deer over large areas with exceptional accuracy while causing minimal disturbance.

Thermal sensors identify the heat signatures emitted by animals, allowing deer to be located even in low-light conditions or areas of dense vegetation. Simultaneously, high-definition optical cameras enable species identification at distances of up to 2 kilometres and, under suitable conditions, sex identification at distances approaching 1 kilometre.

A key advantage of drone-based surveys is the ability to accurately record and map observations. Each deer or herd can be assigned a georeferenced location, allowing surveyors to track movements across the survey area and significantly reduce the risk of double-counting animals as they move between survey sectors.

At GCA Forestry UK, we use thermal drone technology because it provides a safe, efficient, and scientifically robust method of conducting deer censuses. Compared with traditional ground surveys and helicopter counts, thermal drones offer:

• Increased survey accuracy and detection rates.
• Reduced risk of double counting through georeferenced data collection.
• Minimal disturbance to wildlife.
• Access to challenging, remote, or densely wooded terrain.
• Greater cost-effectiveness than manned aerial surveys.
• Permanent evidence-based records through thermal imagery, video, and mapping outputs.

By combining advanced technology with proven survey methodologies, we deliver reliable population assessments that support effective deer management, conservation, and habitat Management .