On August 16, 1916, the United States and Canada put pen to paper on the Migratory Bird Treaty – a binding agreement that drew a hard line against unregulated hunting of birds crossing the shared border. That single document, signed 110 years ago today, became the legal backbone of bird conservation across an entire continent. Here is a quick look at what the treaty locked in, how far it has grown, and why the species count keeps climbing.
How the 1916 Migratory Bird Treaty Stopped the Hunting Free-for-All
Before the treaty existed, birds that flew between the US and Canada had essentially no legal protection once they crossed the border. Market hunters could target migratory flocks without restriction, and several species were already in steep decline by the early 1900s. The 1916 agreement changed that by establishing shared rules: both governments agreed to regulate hunting seasons, ban the trade of protected birds, and limit the taking of eggs and nests. The immediate effect was a hard stop on commercial-scale hunting that had gone unchecked for decades.
The Expansion to Mexico, Japan, and Russia Pushed the Protected Species List Past 800
What started as a bilateral US-Canada deal did not stay bilateral for long. Mexico joined through a separate treaty in 1936, extending protections south through Central American flyways. Japan came on board in 1972, covering Pacific migratory routes. Russia followed in 1976, adding Arctic and sub-Arctic breeding grounds to the protected network. The result: over 800 species now fall under the umbrella of these interconnected agreements – birds ranging from common waterfowl to rare shorebirds that spend different seasons on different continents. That number represents one of the largest coordinated wildlife protection efforts in the Western Hemisphere.
What the Migratory Bird Treaty’s Five-Nation Reach Means for Long-Distance Species
Birds do not observe national boundaries, and that biological reality is exactly why a single-country approach to their protection was never going to work. The treaty framework matters most for long-distance migrants – species that breed in Canadian or Russian Arctic zones, winter along Mexican coastlines, and pass through US flyways twice a year. Without synchronized rules across all five signatory nations, a bird protected in one country could be legally hunted in the next. The five-nation structure closes that gap, giving migratory populations a continuous legal shield across the full length of their annual routes.
A century after two governments agreed on a shared border problem, the framework they built now stretches from Arctic breeding grounds to tropical wintering zones – and the 800-plus species it covers are still flying because of it.
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