Per a suggestion posed by @snowleopard here (Subspecific Tigers in US Zoos), I decided to expand my evaluation of how common tigers were in major American zoos to other popular/ubiquitous zoo animals (also known as ABC animals). As in that thread, I used the list of zoos and aquaria in SL and @Tim Brown's new book America's Top 100 Zoos & Aquariums as my list of "major" zoos and aquariums in the United States. For reference, this is the list (with aquariums and marine parks in bold): Spoiler: List of Zoos & Aquaria ABQ BioPark Zoo Adventure Aquarium Akron Zoo Aquarium of the Pacific Arizona-Sonora Desert Museum Audubon Zoo Binder Park Zoo Birmingham Zoo Bronx Zoo Brookfield Zoo Buffalo Zoo Busch Gardens Tampa Bay Caldwell Zoo California Academy of Sciences Cameron Park Zoo Central Park Zoo Cheyenne Mountain Zoo Cincinnati Zoo & Botanical Garden Cleveland Metroparks Zoo Columbus Zoo & Aquarium Como Park Zoo & Conservatory Dallas World Aquarium Dallas Zoo Denver Zoo Detroit Zoo Disney’s Animal Kingdom El Paso Zoo Florida Aquarium Fort Wayne Children’s Zoo Fort Worth Zoo Fresno Chaffee Zoo Georgia Aquarium Gladys Porter Zoo Great Plains Zoo & Delbridge Museum of Natural History Henry Vilas Zoo Honolulu Zoo Houston Zoo Indianapolis Zoo Jacksonville Zoo & Gardens John Ball Zoo Kansas City Zoo Lincoln Park Zoo Little Rock Zoo The Living Desert Zoo/Gardens Los Angeles Zoo & Botanical Gardens Louisville Zoo Maryland Zoo Memphis Zoo Milwaukee County Zoo Minnesota Zoo Monterey Bay Aquarium Montgomery Zoo Moody Gardens Mystic Aquarium Nashville Zoo at Grassmere National Aquarium New England Aquarium New York Aquarium North Carolina Zoo Oakland Zoo Oklahoma City Zoo & Botanical Garden Omaha’s Henry Doorly Zoo & Aquarium Oregon Coast Aquarium Oregon Zoo Philadelphia Zoo Phoenix Zoo/Arizona Center for Nature Conservation Pittsburgh Zoo & PPG Aquarium Point Defiance Zoo & Aquarium Reid Park Zoo Riverbanks Zoo & Garden Roger Williams Park Zoo Rosamond Gifford Zoo at Burnet Park Sacramento Zoo Saint Louis Zoo San Antonio Zoo San Diego Zoo San Diego Zoo Safari Park San Francisco Zoo Santa Barbara Zoo Seattle Aquarium SeaWorld Orlando SeaWorld San Antonio SeaWorld San Diego Sedgwick County Zoo Shedd Aquarium Smithsonian’s National Zoo Tanganyika Wildlife Park Tennessee Aquarium Texas State Aquarium Toledo Zoo & Aquarium Topeka Zoo & Conservation Center Tulsa Zoo Utah’s Hogle Zoo Virginia Zoo Wildlife World Zoo, Aquarium & Safari Park Woodland Park Zoo Zoo Atlanta Zoo Knoxville Zoo Miami ZooTampa at Lowry Park In order to determine what taxa to evaluate, I used the results from @lintworm's survey of popular European zoo animals here: Ranking the stars; what are the popular zoo animals?. While it focused specifically on Europe, I think the overlap between those zoos and American zoos is very similar; that was at least the sense I got from reviewing the animals that ranked the highest. The following taxa were evaluated; unless by default or otherwise noted, they were not done at species or subspecies level: Lion Tiger Bear (generally and also Polar Bear specifically) Meerkat Otter Pinniped Giraffe Elephant Rhino Hippo (River/Common and Pygmy) Cetacean Lemur Great Ape (Gorilla, Orangutan, and Chimpanzee/Bonobo*) Penguin *combined for purposes of this breakdown I excluded Giant Panda and Koala because neither are ubiquitous outside their native regions, but included Otter as it was noted to be a glaring exception in the survey compared to the other literature LW reviewed. Cetaceans, however, were also included due to their popularity despite also not being ubiquitous; as you will see from the results, they are indeed a significant outlier (but interesting nonetheless). I considered including other ubiquitous or noteworthy taxa (red panda, flamingo, gibbon, giant tortoise, Komodo dragon, etc) but in the interest of time and effort I focused only on what came out at the very top of the survey: that is, they ranked 35 or higher for assumed popularity on a 40-point scale. As one additional side note, I tried to count zoos in the circumstance that a) they seem to only be out of them temporarily, or b) they are phasing them in and the project has already had funding approved or construction begun.