Here I have attempted to make a complete list of herons, ibises, and spoonbills present in American and Canadian collections. Only information 2017 or newer was used. Information on missing holders or species, as well as information on subspecies or populations is welcomed.
Boat-billed Heron (15 holders)
Bronx Zoo (ridgwayi)
Brookfield Zoo
Cincinnati Zoo and Botanical Garden
Connecticut's Beardsley Zoo
Dallas World Aquarium (panamensis)
Detroit Zoo
Franklin Park Zoo
Fresno Chaffe Zoo
Jacksonville Zoo and Gardens
Milwaukee County Zoo
National Aquarium in Baltimore
San Antonio Zoo
Sedgwick County Zoo
Zoo de Granby
Zoo Miami
Black-crowned Night-Heron (7 holders)
Bay Beach Wildlife Sanctuary
Saint Louis Zoo
Salisbury Zoo
Santa Fe Teaching Zoo
SeaWorld San Diego
The Living Desert Zoo and Gardens
Wild Wonders Wildlife Park
Yellow-crowned Night-Heron (4 holders)
Dallas World Aquarium
Florida Aquarium
Fort Worth Zoo
Saint Louis Zoo
Green Heron (6 holders)
Bay Beach Wildlife Sanctuary
California Living Museum
Detroit Zoo
Florida Aquarium
Milwaukee County Zoo
Sequoia Park Zoo
Javan Pond-Heron (6 holders)
Audubon Zoo
Bronx Zoo
Columbus Zoo and Aquarium
Omaha's Henry Doorly Zoo and Aquarium
Zoo Miami
ZooTampa at Lowry Park
Cattle Egret (10 holders)
Cincinnati Zoo and Botanical Garden
Columbus Zoo and Aquarium
Memphis Zoo
Omaha's Henry Doorly Zoo and Aquarium
Oregon Zoo
Saint Louis Zoo
Santa Fe Teaching Zoo
Tennessee Aquarium
Toronto Zoo
Tulsa Zoo
Great Blue Heron (2 holders)
California Living Museum
The Living Desert Zoo and Gardens
Great Egret (2 holders)
Saint Louis Zoo
The Living Desert Zoo and Gardens
Black Heron (1 holder)
San Diego Zoo Safari Park
Snowy Egret (4 holders)
Bronx Zoo
Brookfield Zoo
Lincoln Park Zoo
Tennessee Aquarium
Little Blue Heron (1 holder)
San Antonio Zoo
African Sacred Ibis (8 holders)
Audubon Zoo
Columbus Zoo and Aquarium
Omaha's Henry Doorly Zoo and Aquarium
Pana'ewa Rainforest Zoo and Gardens
San Diego Zoo Safari Park
Special Memories Zoo
Toronto Zoo
ZooTampa at Lowry Park
Straw-necked Ibis (4 holders)
Audubon Zoo
Columbus Zoo and Aquarium
San Antonio Zoo
Sedgwick County Zoo
Waldrapp Ibis (8 holders)
Jacksonville Zoo and Gardens
Louisville Zoo
Milwaukee County Zoo
Omaha's Henry Doorly Zoo and Aquarium
San Francisco Zoo
The Living Desert Zoo and Gardens
The Maryland Zoo in Baltimore
Toledo Zoo and Aquarium
Southern Bald Ibis (3 holders)
Bronx Zoo
San Diego Zoo
San Diego Zoo Safari Park
Hadada Ibis (10 holders)
Columbus Zoo and Aquarium
Fort Worth Zoo
Franklin Park Zoo (brevirostris)
Jacksonville Zoo and Gardens
Lincoln Park Zoo
Oregon Zoo
San Diego Zoo Safari Park
San Francisco Zoo
The Living Desert Zoo and Gardens
Wildlife World Zoo and Aquarium
Black-faced Ibis (3 holders)
Bronx Zoo
Jacksonville Zoo and Gardens
National Aviary
American White Ibis (5 holders)
Aquarium of the Pacific
Florida Aquarium
Los Angeles Zoo and Botanical Gardens
Saint Louis Zoo
Santa Fe Teaching Zoo
Scarlet Ibis (15 holders)
Assiniboine Park Zoo
Audubon Zoo
Cincinnati Zoo and Botanical Garden
Detroit Zoo
Los Angeles Zoo and Botanical Gardens
Milwaukee County Zoo
Minnesota Zoo
Moody Gardens
National Aquarium in Baltimore
Palm Beach Zoo
San Diego Zoo Safari Park
Sylvan Heights Bird Park
Toledo Zoo and Aquarium
Toronto Zoo
Zoo Atlanta
White-faced Ibis (1 holder)
Columbus Zoo and Aquarium
Puna Ibis (1 holder)
Sedgwick County Zoo
Madagascar Crested Ibis (2 holders)
Forth Worth Zoo
San Diego Zoo Safari Park
African Spoonbill (8 holders)
Detroit Zoo
Jacksonville Zoo and Gardens
Lincoln Park Zoo
Oakland Zoo
San Diego Zoo
San Diego Zoo Safari Park
The Maryland Zoo in Baltimore
Toronto Zoo
Roseate Spoonbill (13 holders)
Assiniboine Park Zoo
Bronx Zoo
Brookfield Zoo
Cape May County Park & Zoo
Fort Worth Zoo
Jacksonville Zoo and Gardens
Minnesota Zoo
Palm Beach Zoo
Saint Louis Zoo
Santa Fe Teaching Zoo
Sedgwick County Zoo
Smithsonian National Zoo
ZooAmerica
Boat-billed Heron (15 holders)
Bronx Zoo (ridgwayi)
Brookfield Zoo
Cincinnati Zoo and Botanical Garden
Connecticut's Beardsley Zoo
Dallas World Aquarium (panamensis)
Detroit Zoo
Franklin Park Zoo
Fresno Chaffe Zoo
Jacksonville Zoo and Gardens
Milwaukee County Zoo
National Aquarium in Baltimore
San Antonio Zoo
Sedgwick County Zoo
Zoo de Granby
Zoo Miami
Black-crowned Night-Heron (7 holders)
Bay Beach Wildlife Sanctuary
Saint Louis Zoo
Salisbury Zoo
Santa Fe Teaching Zoo
SeaWorld San Diego
The Living Desert Zoo and Gardens
Wild Wonders Wildlife Park
Yellow-crowned Night-Heron (4 holders)
Dallas World Aquarium
Florida Aquarium
Fort Worth Zoo
Saint Louis Zoo
Green Heron (6 holders)
Bay Beach Wildlife Sanctuary
California Living Museum
Detroit Zoo
Florida Aquarium
Milwaukee County Zoo
Sequoia Park Zoo
Javan Pond-Heron (6 holders)
Audubon Zoo
Bronx Zoo
Columbus Zoo and Aquarium
Omaha's Henry Doorly Zoo and Aquarium
Zoo Miami
ZooTampa at Lowry Park
Cattle Egret (10 holders)
Cincinnati Zoo and Botanical Garden
Columbus Zoo and Aquarium
Memphis Zoo
Omaha's Henry Doorly Zoo and Aquarium
Oregon Zoo
Saint Louis Zoo
Santa Fe Teaching Zoo
Tennessee Aquarium
Toronto Zoo
Tulsa Zoo
Great Blue Heron (2 holders)
California Living Museum
The Living Desert Zoo and Gardens
Great Egret (2 holders)
Saint Louis Zoo
The Living Desert Zoo and Gardens
Black Heron (1 holder)
San Diego Zoo Safari Park
Snowy Egret (4 holders)
Bronx Zoo
Brookfield Zoo
Lincoln Park Zoo
Tennessee Aquarium
Little Blue Heron (1 holder)
San Antonio Zoo
African Sacred Ibis (8 holders)
Audubon Zoo
Columbus Zoo and Aquarium
Omaha's Henry Doorly Zoo and Aquarium
Pana'ewa Rainforest Zoo and Gardens
San Diego Zoo Safari Park
Special Memories Zoo
Toronto Zoo
ZooTampa at Lowry Park
Straw-necked Ibis (4 holders)
Audubon Zoo
Columbus Zoo and Aquarium
San Antonio Zoo
Sedgwick County Zoo
Waldrapp Ibis (8 holders)
Jacksonville Zoo and Gardens
Louisville Zoo
Milwaukee County Zoo
Omaha's Henry Doorly Zoo and Aquarium
San Francisco Zoo
The Living Desert Zoo and Gardens
The Maryland Zoo in Baltimore
Toledo Zoo and Aquarium
Southern Bald Ibis (3 holders)
Bronx Zoo
San Diego Zoo
San Diego Zoo Safari Park
Hadada Ibis (10 holders)
Columbus Zoo and Aquarium
Fort Worth Zoo
Franklin Park Zoo (brevirostris)
Jacksonville Zoo and Gardens
Lincoln Park Zoo
Oregon Zoo
San Diego Zoo Safari Park
San Francisco Zoo
The Living Desert Zoo and Gardens
Wildlife World Zoo and Aquarium
Black-faced Ibis (3 holders)
Bronx Zoo
Jacksonville Zoo and Gardens
National Aviary
American White Ibis (5 holders)
Aquarium of the Pacific
Florida Aquarium
Los Angeles Zoo and Botanical Gardens
Saint Louis Zoo
Santa Fe Teaching Zoo
Scarlet Ibis (15 holders)
Assiniboine Park Zoo
Audubon Zoo
Cincinnati Zoo and Botanical Garden
Detroit Zoo
Los Angeles Zoo and Botanical Gardens
Milwaukee County Zoo
Minnesota Zoo
Moody Gardens
National Aquarium in Baltimore
Palm Beach Zoo
San Diego Zoo Safari Park
Sylvan Heights Bird Park
Toledo Zoo and Aquarium
Toronto Zoo
Zoo Atlanta
White-faced Ibis (1 holder)
Columbus Zoo and Aquarium
Puna Ibis (1 holder)
Sedgwick County Zoo
Madagascar Crested Ibis (2 holders)
Forth Worth Zoo
San Diego Zoo Safari Park
African Spoonbill (8 holders)
Detroit Zoo
Jacksonville Zoo and Gardens
Lincoln Park Zoo
Oakland Zoo
San Diego Zoo
San Diego Zoo Safari Park
The Maryland Zoo in Baltimore
Toronto Zoo
Roseate Spoonbill (13 holders)
Assiniboine Park Zoo
Bronx Zoo
Brookfield Zoo
Cape May County Park & Zoo
Fort Worth Zoo
Jacksonville Zoo and Gardens
Minnesota Zoo
Palm Beach Zoo
Saint Louis Zoo
Santa Fe Teaching Zoo
Sedgwick County Zoo
Smithsonian National Zoo
ZooAmerica
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