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The perception that animals are “overpopulated” in certain areas generally overlooks the fact that their habitat may have been eaten away by development, or their natural predators may have been removed. Whatever the reason, The HSUS is the leading advocate and innovator in humane wildlife-population control.


The HSUS is a leader in the emerging field of immunocontraception—a humane way to control animal populations where it’s necessary and appropriate. This method safely uses the body's immune response to prevent pregnancy without harming the animal or the population as a whole.

Immunocontraception has been used to control deer and wild horse populations across the United States and elephant populations in South Africa.

Overpopulation doesn’t just take place in the wild. That’s why we’ve made immunocontraception technology available to zoos to help alleviate the suffering that results from the excessive breeding of wildlife in captivity.

News & Events

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Our Victories

  • November 9, 2010

    The HSUS and Washington Humane Society Praise DC Council for Passing Wildlife Protection Act

    The HSUS and the Washington Humane Society praised the D.C. Council for passing legislation to regulate wildlife control operators in the District, ensuring consumer protection and humane treatment of wildlife.

  • November 3, 2010

    Voters Support Humane Policies on Election Day

    Voters in Missouri have passed the nation's first statewide ballot measure to protect dogs from the worst abuses at puppy mills, and voters in Arizona resoundingly rejected a legislative power grab on wildlife management. The Humane Society of the United States led campaigns with coalition partners in both states, and these victories are the latest in a string of electoral victories in recent years through animal-protection ballot measures.

  • August 6, 2010

    Federal Court Reinstates Federal Wolf Protections

    In a victory for the gray wolves of the northern Rockies, a federal judge today granted conservationists’ request to stop the slaughter of wolves and reinstate federal Endangered Species Act protections.

  • November 16, 2009

    An Eagle Eye on Wildlife

    Last Friday, Wayne Pacelle paid a visit to our newest animal care center—the SPCA Wildlife Care Center in Ft. Lauderdale, Fla.

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