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Joel Sartore Joel Sartore

National Geographic Photographer and Speaker

Keyword: trapped

Picture of a regal fritillary (Speyeria idalia) at the Minnesota Zoo.

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A regal fritillary (Speyeria idalia) at the Minnesota Zoo. This species is a candidate for federal listing. The catastrophic loss of prairie habitat due to farming/ethanol production has caused this species to go into decline over the past few decades.

Picture of a regal fritillary (Speyeria idalia) at the Minnesota Zoo.

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A regal fritillary (Speyeria idalia) at the Minnesota Zoo. This species is a candidate for federal listing. The catastrophic loss of prairie habitat due to farming/ethanol production has caused this species to go into decline over the past few decades.

Picture of a regal fritillary (Speyeria idalia) at the Minnesota Zoo.

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A regal fritillary (Speyeria idalia) at the Minnesota Zoo. This species is a candidate for federal listing. The catastrophic loss of prairie habitat due to farming/ethanol production has caused this species to go into decline over the past few decades.

Bull trout (Salvelinus confluentus) caught in fishing nets in Lake Pend Oreille, Idaho. (IUCN: Vulnerable; US: Federally threatened)

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Bull trout (Salvelinus confluentus) caught in fishing nets in Lake Pend Oreille, Idaho. (IUCN: Vulnerable; US: Federally threatened)

A female bobolink (Dolichonyx oryzivorus) is caught by biologists using a mist net, near Wood River, Nebraska. Avian ecologists trap and put tiny geolocators, which track sun intensity as well as sunrise and sunset, on male bobolinks. When the birds are recaptured (months from now) and the data is downloaded and used to calculate the birds' migratory route. The species winters in South America, but little is known of its specific route.

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A female bobolink (Dolichonyx oryzivorus) is caught by biologists using a mist net, near Wood River, Nebraska. Avian ecologists trap and put tiny geolocators, which track sun intensity as well as sunrise and sunset, on male bobolinks. When the birds are recaptured (months from now) and the data is downloaded and used to calculate the birds’ migratory route. The species winters in South America, but little is known of its specific route.

Biologists tag a male bobolink (Dolichonyx oryzivorus) in Nebraska. They will put tiny geolocators, which track sun intensity as well as sunrise and sunset, the birds' backs. When the birds are recaptured (months from now) and the data is downloaded and used to calculate the birds' migratory route. The species winters in South America, but little is known of its specific route.

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Biologists tag a male bobolink (Dolichonyx oryzivorus) in Nebraska. They will put tiny geolocators, which track sun intensity as well as sunrise and sunset, the birds’ backs. When the birds are recaptured (months from now) and the data is downloaded and used to calculate the birds’ migratory route. The species winters in South America, but little is known of its specific route.

A male bobolink (Dolichonyx oryzivorus) near Wood River, Nebraska.

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A male bobolink (Dolichonyx oryzivorus) near Wood River, Nebraska.

A biologist holds a male bobolink (Dolichonyx oryzivorus), captured for a study near Wood River, Nebraska. They will put tiny geolocators, which track sun intensity as well as sunrise and sunset, the birds' backs. When the birds are recaptured (months from now) and the data is downloaded and used to calculate the birds' migratory route. The species winters in South America, but little is known of its specific route.

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A biologist holds a male bobolink (Dolichonyx oryzivorus), captured for a study near Wood River, Nebraska. They will put tiny geolocators, which track sun intensity as well as sunrise and sunset, the birds’ backs. When the birds are recaptured (months from now) and the data is downloaded and used to calculate the birds’ migratory route. The species winters in South America, but little is known of its specific route.

Photo: Cowbirds (Molothrus sp.) that were caught in traps set for them at Fort Hood Army Base near Kileen, TX. Of these cowbirds, the females will be killed and the males will be kept to lure other birds.

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Cowbirds (Molothrus sp.) that were caught in traps set for them at Fort Hood Army Base near Kileen, TX. Of these cowbirds, the females will be killed and the males will be kept to lure other birds. The eradication of cowbirds has been going on for awhile here in an effort to study the effect of their parasitism on endangered birds like the black-capped vireo and golden-cheeked warbler.

Biologists capture a male bobolink (Dolichonyx oryzivorus) near Wood River, Nebraska. They will put tiny geolocators, which track sun intensity as well as sunrise and sunset, the birds' backs. When the birds are recaptured (months from now) and the data is downloaded and used to calculate the birds' migratory route. The species winters in South America, but little is known of its specific route.

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Biologists capture a male bobolink (Dolichonyx oryzivorus) near Wood River, Nebraska. They will put tiny geolocators, which track sun intensity as well as sunrise and sunset, the birds’ backs. When the birds are recaptured (months from now) and the data is downloaded and used to calculate the birds’ migratory route. The species winters in South America, but little is known of its specific route.

Biologists capture a male bobolink (Dolichonyx oryzivorus) near Wood River, Nebraska. They will put tiny geolocators, which track sun intensity as well as sunrise and sunset, the birds' backs. When the birds are recaptured (months from now) and the data is downloaded and used to calculate the birds' migratory route. The species winters in South America, but little is known of its specific route.

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Biologists capture a male bobolink (Dolichonyx oryzivorus) near Wood River, Nebraska. They will put tiny geolocators, which track sun intensity as well as sunrise and sunset, the birds’ backs. When the birds are recaptured (months from now) and the data is downloaded and used to calculate the birds’ migratory route. The species winters in South America, but little is known of its specific route.

Photo: A damselfly is caught in a black-and-yellow argiope's (Argiope aurantia) web.

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A damselfly is caught in a black-and-yellow argiope’s (Argiope aurantia) web.

Photo: A damselfly is caught in a black-and-yellow argiope's (Argiope aurantia) web.

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A damselfly is caught in a black-and-yellow argiope’s (Argiope aurantia) web.

Photo: A damselfly is caught in a black-and-yellow argiope's (Argiope aurantia) web.

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A damselfly is caught in a black-and-yellow argiope’s (Argiope aurantia) web.

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