Several days of wind and snow in western Wyoming forced National Park Service officials to delay plans to eradicate non-native mountain goats in Grand Teton National Park, according to park spokeswoman Denise Germann.
The Park Service initially planned to close portions of Grand Teton from Jan. 5 to 12 in order to remove the mountain goats by shooting them from helicopters. Wind earlier in the week created unsafe flying conditions, Germann said on Thursday, while snow from a winter storm later in the week created further issues.
Germann said the removal will be rescheduled, though no dates have yet been determined. An environmental impact study on the removal determined efforts should be completed by early March, when park visitation is low.
Approximately 100 mountain goats dispersed into Grand Teton National Park in recent years. Germann said the animals are descendants of mountain goats released south of the park by the Idaho Department of Fish and Game for hunting purposes in the 1960s and ‘70s.
“We’ve been looking at this for the last few years,” Germann said.
National Park Service officials said the mountain goats carry pathogens that can cause pneumonia, posing a potential threat to a herd of bighorn sheep native to Grand Teton.
“(Disease transmission) has not been documented, but it is a primary concern,” Germann said. “The bighorn sheep have low genetic diversity … because they’re isolated from neighboring herds.”
Germann said using firearms from a helicopter was determined to be the most efficient way to eradicate the mountain goats.
“We’re trying to rapidly reduce their numbers,” she said.
According to the environmental impact study, National Park Service officials believe the entire population of mountain goats can be eradicated in one to five years.
“The National Park Service has a responsibility to arrange for native populations,” Germann said. “When there’s something that jeopardizes that native population, we take action.”
The National Park Service is not the only agency to address the encroaching species. Last year, Wyoming Game and Fish Department opened a new mountain goat hunting season on the west side of the Teton mountain range in an effort to allow hunters to thin the herd. Forty-eight licenses were issued.