042022

A mitigation program operated by the North Carolina Department of Transportation’s Division of Aviation aims to reduce the risk of wildlife hazards by providing a variety of training and support options for both airports and aircraft.

[Above photo by NCDOT]

The agency said North Carolina airports average at least one bird or other wildlife strikes upon aircraft per day, which can cause significant damage. For example, in 2018, an aircraft landing at a general aviation airport sustained more than $800,000 in damage when it struck two of six white-tailed deer crossing the runway. On top of that, the Federal Aviation Administration Wildlife Strike Database​ – which tracks wildlife strikes – estimates that only one in five strikes are reported, which adds up to a significant threat to property and life.

“Flocks of birds taking flight, deer crossing runways, and other such hazards can cause serious damage to property and even loss of life,” noted Rajendra Kondapalli, the program’s manager, in a statement. “Our program focuses on reducing that risk and increasing safety for aircraft that fly in and out of airports across our state.”

The wildlife program, offered through a cooperative agreement with the Wildlife Services Division of the U.S. Department of Agriculture, provides five regional trainings and assessments of one-third of the state’s 72 public airports each year. It also provides “quick-response” management activities for airports experiencing wildlife hazards. 

That “quick response” program provides both proactive and reactive management, NCDOT said, such as harassing geese, gulls, raptors, and other birds using pyrotechnics, habitat management, and, if warranted, lethal control. The USDA may live trap and relocate hazardous raptors such as hawks and falcons to suitable habitats miles away from the airport.   

Trainings provide instruction and hands-on practice in identifying common animal species, potential habitats, and food sources that attract animals to airports and methods to deter wildlife using safe methods from interfering with airport operations.

The wildlife management assessments offered through the program include an airport site visit to conduct a bird and mammal hazard survey and an assessment report with wildlife observations, habitat attractants, and mitigation recommendations based on USDA’s observations. This can range from proper grass height, tree removal, proper fencing, and agriculture near the airfield. “These trainings are very important because they help the airports better understand the hazards on their airfields and what they can do to mitigate them, short-term and long-term,” noted Chris Willis, western district supervisor for the USDA Wildlife Services in North Carolina, who provides the training. “It also helps the aviation [divisions] understand the needs the airport may have or what hazards exist.”

The Arizona Department of Transportation recently illustrated in a blog post how ‘biomonitor’ teams from Northern Arizona University or NAU help the agency’s crews find and relocate endangered species – including snakes, birds, and fish – from construction sites.

[Above photo by the Arizona DOT]

Specifically, the biomonitor teams train construction workers and others involved in transportation projects to identify any endangered species and what to do if they come across one. The teams also monitor construction activity and help safely remove any endangered species out of harm’s way. 

For example, for an Arizona DOT project to protect the I-17 Verde River Bridge footings – set to wrap up later this spring – agency crews built earthen bypass channels to contain river flow, allowing them to work outside of the river area safely. Simultaneously, the biomonitor team removed all fish from pools that required filling in, while also rescuing fish stranded during river relocation work.

Next, the biomonitor team identifies the endangered species it finds, photographing and measuring them, and then releases them back into the Verde River downstream from the construction area.

“The relocation distance varies, but it’s typically about 50 to 150 yards from the capture point,” noted Dr. Erika Nowak, an assistant research professor at NAU, who heads up the biomonitor team for the I-17 Verde River Bridge project.

“We don’t want to release the animals too far away, as moving them out of their home range can disrupt their behavior, cause them to become disoriented, and thus more likely to die,” she added.

This is one of several efforts by Arizona DOT to preserve both animals and plants considered endangered species.

The agency recently completed a bridge replacement project near Globe, AZ, which triggered the return of an endangered species of cactus transplanted and preserved by the agency during the project’s four-year timeline.

The U.S. 60 Pinto Creek Bridge is home to the endangered hedgehog cactus, which grows only within a several-mile radius of the site. About a foot high, usually covered in spines and often with red flowers at the top, the species is listed as endangered by the U.S. Fish and Wildlife Service and is protected under Arizona law. When the bridge replacement project began in 2018, a team comprised of biologists from the Arizona DOT and from the Desert Botanical Garden in Phoenix safely removed 34 cacti potentially affected by the construction work, then nurtured and propagated, replanting 61 total cacti in early March.