Must-See Idaho Migrations
By land, air and stream, Idaho's critters are on the move.
Animals of the world are in motion—flying, swimming, running and crawling to their seasonal homes and breeding grounds. Idaho's varied geography of forests, deserts, sagebrush steppe, rivers and even open farmlands attracts a wide array of wildlife.
Often the first critters that come to mind are the large, four-legged ones we might see from the road or on the trails. But there are also lesser known migrations of the small kind. No matter the size, here is our list of the top five best migrations to watch for in Idaho.
In the spring, as you overlook grasslands and sagebrush prairie, you may encounter this charismatic shorebird. Easily recognized by their long legs and a down-curved bill, the long-billed curlew is the largest member of the sandpiper family and unique in its habitat usage – it is primarily ground-dwelling. They spend winters near southern coasts on wetlands, mudflats, flooded fields, and beaches, often in the southern United States and Mexico. But as the flowers bloom and the weather warms, the curlew make their return to the grasslands of the West, nesting in pastures and wet low spots to provide better feeding area for their young.
You might find these fascinating migratory birds at the Flat Ranch Preserve, located fifteen miles west of West Yellowstone. In an on-going study, several curlews from the Ranch have been fitted with satellite transmitters. Over the course of three years, radar followed one such curlew as she made the challenging 900-mile trip between Mexico and the Ranch each year. Her transmitter has since been removed but the data she provided is invaluable in helping scientists understand the best practices for conserving the long-billed curlew population in Idaho.
The Pahsimeroi and Lemhi rivers are waters that salmon, quite literally, will die for. Each year, these rivers and their tributaries mark the end of a 900-mile journey from the Pacific Ocean for the salmon. When they get to the small streams of central Idaho, they spawn and then die. After hatching and growing, young salmon—called smolts—will begin their own migration to the sea. Many salmon, unfortunately, are stopped short of their final spawning area by insufficient water or irrigation diversions. The Nature Conservancy in Idaho works with landowners and partners to remove those barriers.
While salmon can be difficult to see in large rivers, you can carefully watch them as they move up small streams, such as at the Idaho Department of Fish and Game’s Wildlife Management Area along the Pahsimeroi in May, Idaho. A spectacular place to see the salmon is at Dagger Falls, on the Middle Fork of the Salmon River. Around July 4th, the salmon can be seen leaping up the falls—a dramatic sight.
Although all 14 species of Idaho’s bats migrate South for the winter, the distance of such migrations vary between species. While the majority of Idaho bats will travel short distances of up to 60 miles in search of winter hibernation grounds, the Silver Haired bats and the Hoary bats fly up to 600 miles to seek warmer weather!
Traveling to California, Arizona or even northern Mexico, these bats migrate one of two reasons: a seasonal lack of food or unsuitable living winter living conditions. When the temperatures rise enough for insects to return in the Spring, the bats make the trip back to Idaho. Migratory bats can be spotted in the night skies in many parts of the state including TNC's Ball Creek Preserve.
Pronghorn are the only large mammals remaining from the Pleistocene—the time period when woolly mammoths, cheetahs and giant sloths roamed North America. Their migration routes are millennia old. One such migration was tracked in a study by the Wildlife Conservation Society and Lava Lake Land and Livestock.
Each fall, pronghorn migrate from the low-elevation, sagebrush lava beds of Craters of the Moon National Monument, through private ranches in the Southern Pioneer Mountains, over expansive public lands to the north and into Montana. It’s a migration of 160 miles—one of the longest mammal migrations in North America. In the spring, the pronghorn return to Craters of the Moon, and are very visible in the wide-open sagebrush country.
Each spring, raptors return from Mexico and Central and South America to nest in the rocky canyons of the Snake River. They find the sagebrush plains that surround these canyons to be the perfect place to spend the summer, due to one of the highest densities of ground squirrels in the world. Golden eagles, prairie falcons, ferruginous hawks, burrowing owls and other species build nests in remote canyons, but they can often be seen out hunting in the mornings and afternoons.
Spectacular interactions—golden eagles stealing meals from prairie falcons, red-tailed hawks fighting over territory—can often be observed. A great place to catch the action is the Morley Nelson Snake River Birds of Prey National Conservation Area, located near Kuna. As you watch raptors, keep an eye out for badgers, too, as this area has one of the world’s largest populations of this interesting mammal.