How Drones Can Benefit Wildlife Refuges: Habitat Surveys

Can drones help wildlife refuges with habitat surveys?

Yes, and the work where drones for wildlife refuges help most is counting, mapping and checking large areas that are slow to cover on foot or by truck. The National Wildlife Refuge System has 573 refuges, according to the Wikipedia list as of January 2026, and it covers more than 96 million land acres, according to the U.S. Fish and Wildlife Service as summarized by EBSCO in 2026. Land at that scale rewards any tool that can cover ground quickly and repeat the same route without starting from scratch.

A drone can fly a set route over habitat, water levels and access roads in one outing, then return imagery that staff review at a desk. Aerial surveys are already a common monitoring method, so this is not a new idea. What changes is how quickly a crew can cover a large unit and how easily it can repeat the same route next season.

Used well, a drone shortens the field portion of a survey and leaves a record that staff can compare year to year. It does not remove the need for trained biologists or ground checks. The sections below explain where that line falls, how the day runs, and what a refuge should expect before the first flight.

What makes surveying a refuge slow today?

Refuge land is spread out. The Congressional Research Service puts the system at 856 million acres of lands and waters, with 704 million acres in marine national monuments. Individual refuges vary just as much: one covers about 19.3 million acres, while the smallest covers 0.57 acres, according to the Wikipedia list.

Most of that land is still surveyed by people who walk, drive or boat set routes. Each pass over a remote unit takes crew time, and a repeat count in another season means covering the route again from the start. Staff also carry gear, log conditions and get back before the light fails, which limits how many units one crew can check in a season.

The specialist workforce is small. The Bureau of Labor Statistics counts about 18,200 zoologists and wildlife biologists in 2024, with 2% projected growth from 2024 to 2034, which is slower than the average for all occupations. Government employs 69% of that group, according to the BLS Occupational Outlook Handbook. For a refuge, the same few specialists are often asked to cover more ground than they can walk in a season, so anything that moves routine field time off their calendar has real value.

What are the main benefits of drones at a refuge?

The most measurable benefit is coverage. In an Australian waterfowl study covering nine species on artificial waterbodies, drone counts were 36% higher than ground counts using a spotting scope, and ground counts tended to underestimate group sizes, according to a study indexed on AMiner. A higher count is not automatically a better count, but it does show that ground observers can miss birds in spread out or dense groups.

A drone flies over the water once and captures every group in frame, and that image becomes a permanent record. Staff can recount birds, check water edges and compare shorelines without repeating the flight. Refuges can also fly the same grid across seasons, which turns a one-day snapshot into a usable trend.

Water level, vegetation edges and road condition all benefit from that kind of repeat record, because the question changes from what happened today to what changed since last year.

Refuges are already testing this. Federal and university scientists use unmanned aerial systems to survey duck populations at a southwestern refuge, and a related project is building a survey and image-interpretation workflow for Southwest Region refuges, according to the project page. In 2013, the Fish and Wildlife Service partnered with the USGS to test unmanned aircraft for surveying waterbird abundance and distribution at a California refuge complex, according to the USGS.

How does a drone work at a refuge day to day?

The day starts with a check, not a flight. Staff confirm wind, weather, airspace status, battery condition and the planned route for each unit. The flight plan repeats the same grid each survey, so imagery from one season lines up with the next.

In the air, the drone flies the grid at a set height and speed, recording images of water, vegetation, roads and fence lines. A trained pilot keeps it in sight and stops if conditions change. Flights are short enough to fit between other refuge tasks, and batteries are swapped between runs.

Processing is where the time moves. Imagery has to be stitched, checked and counted on a computer, often after the crew has packed up. Plan for that step from the start, because processing time is one of the real drawbacks of the method. Staff who review the images should know the unit, so questions go back to someone who can walk the site.

Compare aerial counts with the notes ground staff logged that morning. Where they disagree, the crew goes back out on foot or by boat rather than trusting either record alone.

Which areas of a refuge does a drone work in?

A drone earns its place wherever a refuge needs a repeatable picture of land or water. The six areas below are the most common. Each has its own route, altitude and timing, and staff set those limits with the refuge biologist.

Timing matters as much as place. In spring, nesting colonies and breeding waterfowl set the order, so flights are planned around the season and the birds rather than around the drone. Late in the year, water levels, road washouts and fence breaks become the priority before access closes or weather turns.

Nesting colonies need the most care. A drone should keep a set distance and altitude from birds that are breeding, and the refuge biologist should approve any flight over a colony before the season opens. Some sites may be off limits for flights entirely, and the plan should say so in writing.

Does a drone replace refuge staff?

No. The drone takes over repeated flying of set routes, not the judgment behind the count. Biologists still decide which species matter, which counts need a closer look, and what a change in water level means for a unit. A refuge that adds a drone still needs its people on site.

Published comparisons of drone and ground monitoring of breeding shorebirds reach a similar conclusion. For small colonies a drone can be a strong counting tool, but it is not a full substitute for ground census programs. Equipment, processing time and weather all have to be part of the plan.

In practice the crew keeps its ground skills. Field staff still walk the sites the drone flags, check fence breaks by hand, and confirm anything odd in the imagery before a report goes out.

What drives the savings in hours?

The savings come from field time, which is what refuges have least of. A drone shortens the walking and driving portion of a route and moves much of the review to a desk, where staff can work through imagery at a pace that fits the rest of their week.

We do not give hour figures from a general estimate. Every refuge has its own units, distances, seasons and staffing, so the savings are measured on your own routes. During the site assessment we time the existing survey, map the routes a drone would fly, and show which hours would move off the field schedule.

Hours only pay off if they are reassigned. Time freed from walking routes can go to species checks, habitat work, or follow-up on problems the aerial data points toward. Some of the saving is also in travel, since fewer full crew trips to a remote unit can mean fewer hours on the road. The lease quote is built from what the site needs, not from a promise about hours.

What can a drone not do at a refuge?

A drone cannot see through dense canopy, identify every bird by sound, or fly in weather that grounds it. Wind, rain, fog and low light all limit flights, and battery life sets how much ground one outing covers. Plan around these limits rather than assuming the drone will always be in the air.

It also cannot replace a permit, a closed season, or a biologist's decision about whether a colony should be disturbed. Airspace rules and refuge flight policy apply, and the refuge should confirm them before the first flight. On a windy day, the crew falls back to the ground routes it already uses, so every schedule should keep that fallback.

Imagery has limits too. Under heavy cover, a drone may miss animals that a person on foot would find through sign or sound. A count from the air is a count of what was visible in that frame, and the report should say so.

How do we get started at your refuge?

Start with a free site assessment. We look at the units you need to survey, the routes and seasons involved, and the refuge rules that apply. We pick the right robot for the site, which for this work is usually a drone with the sensors your survey needs, and we plan the deployment around your existing schedule.

The drone is leased through lease financing programs, so the refuge does not have to fund the whole unit at once. The payment comes in the quote after the site assessment, once we know the routes, units and service needs. Many refuges begin with one leased unit and one survey route, then expand once the team trusts the workflow.

We deploy and integrate the drone, train the staff who fly it and review the imagery, and service it nationwide, so a refuge has one number to call when a flight needs attention. A first season tends to go smoothly when the routes are settled before the first flight and the whole crew has been through the training.