A large network of American wetland refuges was bought with money from hunters. The mechanism is a federal stamp that waterfowl hunters must buy each season before they can hunt.
A license requirement became a funding stream
Adult waterfowl hunters must carry a signed federal stamp in addition to their state license. It is a permit, and buying it is not optional for anyone hunting migratory waterfowl.
Nearly all of the money is directed to acquiring or leasing wetland habitat, not to agency overhead. That earmark is what distinguishes it from ordinary license revenue.
Because it is tied to a compulsory purchase rather than to annual appropriations, the flow of money is steady in a way that budget lines rarely are.
Wetlands were the resource being lost
The program emerged from a period when drainage for agriculture was removing prairie wetlands at speed and waterfowl populations were falling steeply.
Waterfowl depend on shallow seasonal wetlands for breeding, and those are the easiest to drain and the least likely to be protected as scenic land.
Buying them outright, or buying easements preventing drainage, addressed the cause directly rather than regulating around it.
Easements often beat outright purchase
Much of the acreage secured is not owned by the government but covered by perpetual easements barring draining, filling or burning of wetland basins.
Farmers keep the land, keep farming the uplands and keep the crop income, while the depressions that flood each spring stay unaltered.
Per dollar, easements protect far more acres than fee purchase, and they leave the land on local tax rolls, which reduces county opposition.
Non-hunters buy in for other reasons
The stamp is sold to anyone, and birders buy it both to fund habitat and because it grants entry to refuges that charge admission.
Stamp artwork is chosen through an annual federal art competition, and collectors purchase prints independently of any conservation interest.
These add revenue at the margin, but the core of the program still rests on hunters buying a permit they are legally required to hold.
The model has limits worth naming
Revenue tracks hunter numbers, and participation in waterfowl hunting has not grown with the population. A shrinking user base is a shrinking funding base.
Land prices meanwhile rise faster than a fixed stamp price, so each dollar buys less acreage than it did, and price increases require legislation.
The result is a program with a durable structure and an eroding purchasing power, which is why proposals to broaden who contributes recur regularly.