Passed nearly a century ago, the Migratory Bird Treaty Act prohibits the harming of just about all native birds, along with their nests and eggs. To this day it remains the primary tool for protecting non-endangered species. As threats to birds continue to evolve, so does the law itself.
Here’s a look back at some of the key moments in the law’s evolution to date.
1800s: With essentially zero regulations in place, market hunters decimate U.S. bird populations, in part so that well-to-do women can wear hats adorned with ornamental feathers. By the end of the century, Labrador Ducks and Great Auks are extinct, soon to be joined by Passenger Pigeons, Carolina Parakeets, and Heath Hens. Numerous other species stand on the brink. Outrage over these alarming trends leads to the formation of the first Audubon societies, as well as other conservation groups.
1900: Congress passes the Lacey Act, the first federal law to protect wildlife. It takes aim at market hunters by prohibiting them from selling poached game across state lines.
1913: Congress passes the Weeks-McLean Migratory Bird Act, which, in another broadside against market hunters, bans the spring shooting of migratory game and insectivorous birds and declares them to be under the “custody and protection” of the federal government. However, two district courts soon rule the act unconstitutional.
1916: The United States signs a treaty with Great Britain (acting on behalf of Canada, then part of the British Empire), in which the two countries agree to stop all hunting of insectivorous birds and to establish specific hunting seasons for game birds. The stated goal is to preserve those species considered beneficial or harmless to man.
1918: To implement the new treaty, Congress passes the Migratory Bird Treaty Act, which officially makes it a crime to “pursue, hunt, take, capture, kill,” or “sell” a migratory bird or any of its parts, including nests, eggs, and feathers. The newly passed act eliminates “the necessity of watching the legislation of every state and of combating the numberless attempts to legalize the destruction of birds for private gain,” according to famed ornithologist Frank M. Chapman (also the founder of Audubon magazine).
1920: The U.S. Supreme Court shoots down a challenge to the constitutionality of the Migratory Bird Treaty Act, ruling that it does not violate states’ rights.
1936: Following up on its treaty with Great Britain, the United States signs a similar treaty with Mexico (it would go on to sign additional treaties with Japan and the Soviet Union in the 1970s). As a result, more birds are protected under the Migratory Bird Treaty Act, and habitat conservation and pollution abatement is encouraged.
1940: Congress passes the Bald Eagle Protection Act, the first federal legislation to ban hunting or otherwise disturbing America’s national emblem (it would later be amended to include Golden Eagles). Modeled after the MBTA, it nonetheless fails to stem the Bald Eagle’s decline at the hands of DDT poisoning.
1970s: For the first time, U.S. prosecutors begin charging not just hunters who violate the MBTA, but also oil and gas, timber, mining, chemical, and electricity companies. Though not directly targeting wildlife, these industries incidentally cause millions of bird deaths each year that could have been avoided with simple infrastructure modifications, according to the U.S. Department of Justice. In publicly available documents, the DOJ states that it will first notify companies of a violation and work with them to correct it. But if they “ignore, deny, or refuse to comply” with best management practices, then the “matter may be referred for prosecution.”
1972: An amendment to the MBTA protects an additional 32 families of birds, including eagles, hawks, owls, and corvids (crows, jays, and magpies). Even more species have been added since, bringing the total number to 1,026—almost every native species in the United States. With such additions, the word “‘migratory” in the act’s title becomes largely symbolic—many birds that do not embark on actual migrations are still protected.
2000: A federal appeals court holds that private citizens (such as conservation groups) may sue the government over alleged violations of the Migratory Bird Treaty Act. Nonetheless, they remain unable to sue out-of-compliance private companies, which differs in that regard from the Endangered Species Act and many other environmental laws.
2001: Just before leaving office, President Bill Clinton orders all relevant federal agencies, including the Department of Defense and the U.S. Forest Service, to take migratory bird conservation into account as part of their regular decision making.
2002: A federal district court rules that the U.S. Navy violated the MBTA during live-fire exercises in the northern Marianas Islands. Congress responds by exempting the incidental taking of birds during “military readiness activities.”
2013: In a first, the Department of Justice enforces the MBTA against a wind farm operator, imposing $1 million in penalties for the killing of Golden Eagles and other protected birds at two sites in Wyoming. It follows this up a year later with $2.5 million in penalties against a second Wyoming wind farm operator. Actual enforcement of the MBTA against these problems tends to be sporadic.
2015: The U.S. Fish and Wildlife Service announces that it will rethink the MBTA's implemention to hold industries more accountable for the harm they do to birds. Specifically, the changes will address bird deaths due to open oil pits, power lines, gas flares, cell phone towers, and wind turbines—which combined kill millions of birds each year.
“Every day, countless death traps across America needlessly kill birds in horrible ways, from electrocution to drowning in oil—we’re talking about tens of millions of birds every year,” National Audubon Society President and CEO David Yarnold said in a statement. “It’s time to end this terrible and unnecessary slaughter.”
Read more about the update here.