The 18 most-wanted birds in North America
Elf Owl
1. To avoid being eaten or having their nests raided, small birds often gang up on larger birds or other predators. The behavior is known as mobbing, and it works because the predators are typically chased away. Elf Owls in groups of 3-6 have been known to mob Great Horned Owls, which are 35 times heavier, as well as gopher snakes and raccoon-like ringtails. 2. Not many birds are both mobbers and mobbees, but Elf Owls are. American Robins, Bridled Titmice, and Black-throated Gray Warblers have been observed mobbing Elf Owls. 3. It’s easy to understand why Elf Owls would mob larger birds: Great Horned Owls, hawks, and Mexican Jays will prey on adults and nestlings. 4. Why songbirds bother mobbing Elf Owls is curious; the small owls eat primarily moths, beetles, and crickets and have not been reported preying on birds. 5. In southeastern Arizona, Elf Owl is easiest to find from late March through mid-July, when it is most vocal. It remains in its breeding range in the United States until early October, when it migrates to Mexico. 6. Its migration routes are unknown, but it has been reported in spring and late summer in flocks. (How cool is that?) 7. The species was once reliable along the lower Colorado River in southern Nevada, southeastern California, and western Arizona, but it’s rare in the region now. In the 20th century, the bird lost out to water diversions, invasive plants, and development along the river. 8. In fact, it was listed as Endangered in California in 1980. 9. In 2004, the U.S. Bureau of Reclamation launched efforts to restore native plants and animals, including Elf Owls, along the river valley. Two of the goals are to create no less than 1,784 acres of Elf Owl habitat and to install lots of nest boxes. 10. In the spring of 2010 and 2011, researchers from the Great Basin Bird Observatory made detailed observations of owls and their habitats on the nearby Bill Williams River National Wildlife Refuge in western Arizona. The study was a critical step toward returning breeding Elf Owls to the lower Colorado River valley.
1. To avoid being eaten or having their nests raided, small birds often gang up on larger birds or other predators. The behavior is known as mobbing, and it works because the predators are typically chased away. Elf Owls in groups of 3-6 have been known to mob Great Horned Owls, which are 35 times heavier, as well as gopher snakes and raccoon-like ringtails. 2. Not many birds are both mobbers and mobbees, but Elf Owls are. American Robins, Bridled Titmice, and Black-throated Gray Warblers have been observed mobbing Elf Owls. 3. It’s easy to understand why Elf Owls would mob larger birds: Great Horned Owls, hawks, and Mexican Jays will prey on adults and nestlings. 4. Why songbirds bother mobbing Elf Owls is curious; the small owls eat primarily moths, beetles, and crickets and have not been reported preying on birds. 5. In southeastern Arizona, Elf Owl is easiest to find from late March through mid-July, when it is most vocal. It remains in its breeding range in the United States until early October, when it migrates to Mexico. 6. Its migration routes are unknown, but it has been reported in spring and late summer in flocks. (How cool is that?) 7. The species was once reliable along the lower Colorado River in southern Nevada, southeastern California, and western Arizona, but it’s rare in the region now. In the 20th century, the bird lost out to water diversions, invasive plants, and development along the river. 8. In fact, it was listed as Endangered in California in 1980. 9. In 2004, the U.S. Bureau of Reclamation launched efforts to restore native plants and animals, including Elf Owls, along the river valley. Two of the goals are to create no less than 1,784 acres of Elf Owl habitat and to install lots of nest boxes. 10. In the spring of 2010 and 2011, researchers from the Great Basin Bird Observatory made detailed observations of owls and their habitats on the nearby Bill Williams River National Wildlife Refuge in western Arizona. The study was a critical step toward returning breeding Elf Owls to the lower Colorado River valley.
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11 June 2022
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