Joel Sartore Joel Sartore

National Geographic Photographer and Speaker

Keyword: Neck sac

Picture of a Magnificent Frigatebird (Fregata magnificens) on North Seymour, in the Galapagos Islands.

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The Magnificent Frigatebird (Fregata magnificens) on North Seymour, in the Galapagos Islands.

Picture of a Magnificent Frigatebird (Fregata magnificens) on North Seymour, in the Galapagos Islands.

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The Magnificent Frigatebird (Fregata magnificens) on North Seymour, in the Galapagos Islands.

Picture of a Magnificent Frigatebird (Fregata magnificens) on North Seymour, in the Galapagos Islands.

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The Magnificent Frigatebird (Fregata magnificens) on North Seymour, in the Galapagos Islands.

Picture of a Magnificent Frigatebird (Fregata magnificens) on North Seymour, in the Galapagos Islands.

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The Magnificent Frigatebird (Fregata magnificens) on North Seymour, in the Galapagos Islands.

Picture of a Magnificent Frigatebird (Fregata magnificens) on North Seymour, in the Galapagos Islands.

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The Magnificent Frigatebird (Fregata magnificens) on North Seymour, in the Galapagos Islands.

Photo: In Galapagos National Park, a male great frigatebird (Fregata minor) distends his striking red gular sac in hopes of attracting a mate.

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In Galapagos National Park, a male great frigatebird (Fregata minor) distends his striking red gular sac in hopes of attracting a mate.

Photo: Two male great frigatebirds (Fregata minor) as they display their giant red neck sacks in hope of attracting a female, on Tower Island in Galapagos National Park.

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Two male great frigatebirds (Fregata minor) as they display their giant red neck sacks in hope of attracting a female, on Tower Island in Galapagos National Park.

Photo: Two male great frigatebirds (Fregata minor) as they display their giant red neck sacks in hope of attracting a female, on Tower Island in Galapagos National Park.

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Two male great frigatebirds (Fregata minor) as they display their giant red neck sacks in hope of attracting a female, on Tower Island in Galapagos National Park.

Photo: Great frigatebirds (Fregata minor) in flight on Tower Island in Galapagos National Park.

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Great frigatebirds (Fregata minor) in flight on Tower Island in Galapagos National Park. The males display their giant red neck sacks in hope of attracting a female.

Photo: Great frigatebirds (Fregata minor) in flight on Tower Island in Galapagos National Park.

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Great frigatebirds (Fregata minor) in flight on Tower Island in Galapagos National Park. The males display their giant red neck sacks in hope of attracting a female.

Picture of a Magnificent Frigatebird (Fregata magnificens) on North Seymour, in the Galapagos Islands.

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The Magnificent Frigatebird (Fregata magnificens) on North Seymour, in the Galapagos Islands.

Picture of a Magnificent Frigatebird (Fregata magnificens) on North Seymour, in the Galapagos Islands.

Photo

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The Magnificent Frigatebird (Fregata magnificens) on North Seymour, in the Galapagos Islands.

Photo: On the North Seymour Island in Galapagos National Park, a male great frigatebird (Fregata minor) distends his striking red gular sac in hopes of attracting a mate.

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On the North Seymour Island in Galapagos National Park, a male great frigatebird (Fregata minor) distends his striking red gular sac in hopes of attracting a mate.

Photo: On the North Seymour Island in Galapagos National Park, a male great frigatebird (Fregata minor) distends his striking red gular sac in hopes of attracting a mate.

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On the North Seymour Island in Galapagos National Park, a male great frigatebird (Fregata minor) distends his striking red gular sac in hopes of attracting a mate.

Photo: The red gular sac of a male great frigatebird (Fregata minor), on North Seymour Island in Galapagos National Park

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The red gular sac of a male great frigatebird (Fregata minor), on North Seymour Island in Galapagos National Park

Picture of a male magnificient frigatebird, Fregata magnificens, on North Seymour Island in Galapagos National Park.

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In Galapagos National Park, a male great frigatebird (Fregata minor) distends his striking red gular sac in hopes of attracting a mate.

Photo: In Galapagos National Park, a male great frigatebird (Fregata minor) distends his striking red gular sac in hopes of attracting a mate.

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In Galapagos National Park, a male great frigatebird (Fregata minor) distends his striking red gular sac in hopes of attracting a mate.

Photo: In Galapagos National Park, a male great frigatebird (Fregata minor) distends his striking red gular sac in hopes of attracting a mate.

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In Galapagos National Park, a male great frigatebird (Fregata minor) distends his striking red gular sac in hopes of attracting a mate.

Photo: Male and female greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

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Male and female greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

Photo: Male and female greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

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Male and female greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

Photo: Male greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

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Male greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

Photo: Male greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

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Male greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

Photo: Male and female greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

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Male and female greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

Photo: Male and female greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

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Male and female greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

Photo: Male and female greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

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Male and female greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

Photo: Male and female greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

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Male and female greater sage grouse (Centrocercus urophasianus) at a display ground near Craig, CO.

Photo: A male Attwater's prairie chicken booming at The Nature Conservancy's Texas City Prairie Preserve.

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A male Attwater’s prairie chicken booming at The Nature Conservancy’s Texas City Prairie Preserve.

Photo: A wild male Attwater's prairie-chicken booming at The Nature Conservancy's Texas City Prairie Preserve.

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A wild male Attwater’s prairie-chicken booming at The Nature Conservancy’s Texas City Prairie Preserve.

Photo: Close-up portrait of a male Attwater's prairie-chicken.

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Close-up portrait of a male Attwater’s prairie-chicken.

Photo: Wild male Attwater's prarie-chickens face off for the chance to breed with females at The Nature Conservancy's Texas City Prairie Preserve.

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Wild male Attwater’s prarie-chickens face off for the chance to breed with females at The Nature Conservancy’s Texas City Prairie Preserve.

Photo: An Attwater's prairie-chicken shakes off the rain near Texs City, Texas.

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An Attwater’s prairie-chicken shakes off the rain near Texs City, Texas.

Photo: Wild male Attwater's prarie-chickens face off for the chance to breed with females at The Nature Conservancy's Texas City Prairie Preserve.

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Wild male Attwater’s prarie-chickens face off for the chance to breed with females at The Nature Conservancy’s Texas City Prairie Preserve.

Photo: A wild male Attwater's prairie-chicken booming at The Nature Conservancy's Texas City Prairie Preserve.

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A wild male Attwater’s prairie-chicken booming at The Nature Conservancy’s Texas City Prairie Preserve.

Photo: Close-up portraits of a male Attwater's prairie-chicken (endangered).

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Close-up portraits of a male Attwater’s prairie-chicken (endangered).

Photo: Close-up portraits of a male Attwater's prairie-chicken (endangered).

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Close-up portraits of a male Attwater’s prairie-chicken (endangered).

Photo: Julie Jensen Director of Marketing | WVC O: 866.800.7326 | D: 702.443.9249 | E: j.jensen@wvc.org

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