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Each winter, U.S. Fish and Wildlife Service (USFWS) biologists carry out an annual population survey of endangered whooping cranes along the Texas Gulf Coast. The survey focuses on the only naturally established migratory flock in the world, the Aransas-Wood Buffalo Population which winters in Texas and breeds in Canada. This year, the Coastal Program contributed to the survey through both financial support and direct staff involvement. The Coastal Program funds helped offset operational expenses associated with conducting the count and a Coastal Program staff member assisted with aerial operations. These contributions highlight the importance of collaboration across USFWS programs in advancing species recovery along the Texas coast.
In late January, survey crews from different USFWS programs (Coastal Program, Migratory Bird Management Division, Biological Sciences Division, Refuges and National Wildland Fire Service) took to the air to count cranes across coastal marshes, including habitat surrounding Aransas National Wildlife Refuge and adjacent properties where the birds overwinter. Flying established transect routes in small aircraft, observers count each crane and note whether individuals are adults or juveniles. Standardized methods enable scientists to compare data across years and evaluate trends in population size and reproductive success.
Tracking the number of birds that return each season allows the Service to evaluate recovery progress over time and refine conservation strategies. The number of juveniles recorded during winter surveys provides particularly valuable insight, as it reflects nesting outcomes from the previous breeding season at Wood Buffalo National Park in Canada and surrounding areas. Strong recruitment of young birds supports long-term stability and contributes to continued population growth.
Population estimates in recent years show continued progress in recovery. From a dangerously low number of fewer than two dozen birds in the early 1940s, the flock has grown to more than 500 individuals today. Over several decades, the population has increased at an average rate of roughly 4% per year, reflecting sustained habitat protection and coordinated conservation efforts in both the United States and Canada.
Although the upward trend is encouraging, whooping cranes remain endangered and vulnerable to habitat loss and other threats. Ongoing monitoring, habitat conservation, and interagency cooperation are critical to ensuring that recovery continues. The annual USFWS winter survey remains a vital tool in that effort, providing the science-based information needed to guide conservation actions and safeguard the species for generations to come.
