The Alaska Zoo is a zoo located on 25 acres (10 ha) of the Anchorage Hillside in Anchorage, Alaska. With approximately 200,000 tourists per year, it is a major destination in Alaska.

More than 100 birds and mammals from 50 species are now housed at the zoo. The zoo boasts the most diverse collection of species endemic to Alaska, as well as exotics such Amur tigers, Bactrian camels, and yaks.

In addition to animal watching, the zoo focuses on teaching, research, wildlife conservation, and animal rehabilitation; many of the animals in the zoo were orphaned or injured when they were discovered.

The Bronx Zoo (also known as the Bronx Zoological Park or the Bronx Zoological Gardens) is a zoo located in Bronx Park in New York City. It is the largest metropolitan zoo in the United States by area, with 265 acres (107 hectares) of park areas and naturalistic habitats separated by the Bronx River. As of 2009, the zoo had an average of 2.15 million visitors each year. Astor Court, the zoo's first permanent structures, were planned as a series of Beaux-Arts pavilions arranged around a big circular sea lion pool. Sculptor Paul Manship constructed the Rainey Memorial Gates in 1934, and they were added to the National Register of Historic Places in 1972.

On November 8, 1899, the zoo opened with 843 animals in 22 exhibits. William Temple Hornaday, the organization's first director, served for 30 years. The zoo has been an important part of animal conservation since its inception. The American Bison Society was founded in 1905 in an attempt to save the American bison from extinction, as the population had been reduced from tens of millions to only a few hundred animals. They were successfully reintroduced into the wild two years later. Three Chinese alligators were successfully returned into the wild by the zoo in 2007. The breeding marked a significant step forward in the zoo's 10-year effort to return the species to China's Yangtze River.

The Bronx Zoo is currently known around the world for its extensive and diversified animal collection, as well as its award-winning exhibitions. The zoo is part of the Wildlife Conservation Society's (WCS) integrated system of four zoos and one aquarium, and it is accredited by the Association of Zoos and Aquariums (AZA).

After the Roger Williams Park Zoo, the Cincinnati Zoo & Botanical Garden is the second oldest zoo in the United States, having been founded in 1873 and officially opening in 1875. (1872). It is located in Cincinnati, Ohio's Avondale area. It started with 64.5 acres (26.5 ha) in the heart of the city, but has since expanded to include adjacent blocks and many reserves in Cincinnati's outskirts. In 1987, it was designated as a National Historic Landmark.

Over 500 animal species and 3,000 plant types are housed at the zoo. In addition, the zoo has run various breeding operations over the years, including being the first to successfully breed California sea lions. The Lindner Center for Conservation and Research of Endangered Wildlife (CREW) was established in 1986 to support the zoo's conservation goals. Martha, the last live passenger pigeon, and Incas, the last living Carolina parakeet, are both residents of the zoo.

The Association of Zoos and Aquariums (AZA) has accredited the zoo, and it is a member of the World Association of Zoos and Aquariums (WAZA). The Cincinnati Zoo was ranked among the finest zoos in the country by USA Today in 2014, based on data provided by the Association of Zoos and Aquariums. The Cincinnati Zoo was rated the finest zoo in North America in a USA Today reader's choice list of the country's best zoos in 2019.

The Detroit Zoo is a zoo in Royal Oak and Huntington Woods, Michigan, about 2 miles (3.2 kilometers) north of Detroit, at the confluence of Woodward Avenue, 10 Mile Road, and Interstate 696. The Detroit Zoological Society (DZS), a non-profit organization, runs it, together with the Belle Isle Nature Center, which is located on Belle Isle within the city limits of Detroit. The Detroit Zoo is one of the state's most popular family attractions, with over 1.5 million visits each year. It is home to almost 2,400 animals representing 235 species on 125 acres of naturalistic exhibits. The Detroit Zoo was the first zoo in the United States to make substantial use of barless exhibits.

The Houston Zoo is a 55-acre (22 ha) zoological park in Houston, Texas, United States, located within Hermann Park. The zoo is home to around 6,000 animals representing 900 different species. It is the second most visited zoo in the United States, with 2.1 million people per year. The Association of Zoos and Aquariums has granted it accreditation (AZA).

The Houston Zoo connects communities with animals, encouraging action to safeguard wildlife, says the Houston Zoo's mission statement.

Since 2002, the zoo has been run by the non-profit Houston Zoo Inc., after previously being run by the City of Houston.

Yucca brevifolia is a plant species from the Yucca genus. Joshua tree, yucca palm, tree yucca, and palm tree yucca are all frequent names for this plant because of its tree-like form.

This monocotyledonous tree is native to the dry Southwest, notably California, Arizona, Utah, and Nevada, as well as northern Mexico (Baja California, Baja California Sur, Sinaloa, and Sonora). It's usually found in the Mojave Desert, between 400 and 1,800 meters (1,300 and 5,900 feet) above sea level. It thrives in Joshua Tree National Park's broad grasslands of Queen Valley and Lost Horse Valley. Other areas with substantial populations of the tree include Mohave County northeast of Kingman, Arizona, and U.S. 93 between Wickenburg and Wikieup, which has been designated as the Joshua Tree Parkway of Arizona. Until the Dome fire in August 2020, a lush Joshua tree forest thrived on the Cima Dome in the Mojave National Preserve.

The Maryland Zoo, also known as The Maryland Zoo in Baltimore and formerly known as The Baltimore City Zoo or the Baltimore Zoo, is a 135-acre park in historic Druid Hill Park in the northwestern part of Baltimore, Maryland, United States of America. Its postal address is 1876 Mansion House Drive. Druid Hill was the city's first major park acquisition in 1876, and was later designed by acclaimed nationally-known landscaper Frederick Law Olmsted (1822-1903)[citation needed], with further work on various park buildings performed by future Baltimore City Hall architect George A.

Park Commissioner John H.B. Latrobe (son of previous prominent British-American architect Benjamin Henry Latrobe [1764-1820]), who was also an outstanding lawyer, author, artist, amateur architect, and civic leader. Olmsted had previously won a competition for the design of plans for New York City's iconic Central Park in midtown Manhattan a year after it opened, and worked on the vast public works project from 1858 to 1873. The Maryland Zoo is certified by the Association of Zoos and Aquariums and is home to nearly 2,000 animals (AZA).

The Oregon Zoo, once known as the Portland Zoo and later known as the Washington Park Zoo, is a zoo in Washington Park, Portland, Oregon, about 2 miles (3.2 kilometers) southwest of downtown Portland. It is the oldest zoo west of the Mississippi River, having opened in 1888.

The regional Metro government owns the 64-acre (26-hectare) zoo. It now houses over 1,800 animals representing over 230 species, including 19 endangered and 9 threatened species. In addition to animal exhibits and specialist gardens, the zoo has a large plant collection.

The zoo also runs and maintains the 2 ft 6 in (762 mm) narrow gauge Washington Park & Zoo Railway, which used to connect to the park's International Rose Test Garden but now only runs within the zoo.

With over 1.6 million visitors in 2016, the Oregon Zoo is the state's largest paid and possibly most popular visitor attraction. The Association of Zoos and Aquariums, as well as the World Association of Zoos and Aquariums, are both members of the zoo.

The Potter Park Zoo is a 102-acre (41.3-hectare) zoo in Lansing, Michigan, that is located within Potter Park. Its goal is to motivate people to protect animals in the wild. Potter Park Zoo is Michigan's oldest public zoo, with over 160 animal species. It is owned by Lansing and maintained by Ingham County. The zoo is a member of the Association of Zoos and Aquariums' (AZA) Species Survival Plan (SSP), which is aimed at managing and conserving threatened or endangered animals. Medical care for the zoo's animals is provided by the Michigan State University College of Veterinary Medicine.

The San Antonio Zoo is a zoo in Midtown San Antonio, Texas, that is accredited by the Association of Zoos and Aquariums. It's in Brackenridge Park, which is part of the city. Over 3,500 animals from 750 species are housed in the 35-acre (14 hectare) zoo. The zoo attracts over a million visitors each year. It also operates non-animal attractions such as the San Antonio Zoo Eagle train ride, which uses three Chance Rides C.P. Huntington engines and first debuted in 1956.

In 1948, the Richard Friedrich Aquarium opened its doors. Until SeaWorld San Antonio opened in 1988, it was the city's only aquarium.

The San Diego Zoo is a zoo located in Balboa Park, San Diego, California, that houses approximately 12,000 animals from over 650 species and subspecies on a 100-acre (40-hectare) plot of land leased from the City of San Diego. San Diego Zoo Wildlife Alliance, the organization's parent, is a private nonprofit conservation organization with one of the world's largest zoological membership associations, with over 250,000 member households and 130,000 child memberships, representing over a half million people.

The San Diego Zoo was a forerunner in the notion of cage-free, open-air exhibits that mimic natural animal habitats. The zoo housed and successfully produced giant pandas for decades, however the pandas were returned to China in 2019.

San Diego Zoo is the most visited zoo in the United States, with over 4 million visitors in 2018. It has also been rated as one of the top zoos in the world by visitors. The San Diego Zoo is a member of the American Alliance of Museums (AAM), the Association of Zoos and Aquariums (AZA), and the World Association of Zoos and Aquariums (WAZA) (WAZA). The San Diego Zoo Safari Park is run by the San Diego Zoo Wildlife Alliance.

The Singapore Zoo, originally known as the Singapore Zoological Gardens or Mandai Zoo, is located on the outskirts of Upper Seletar Reservoir in Singapore's highly forested central catchment area, covering 28 hectares (69 acres). The zoo was created with a $9 million grant from the Singapore government and opened on June 27, 1973. Mandai Wildlife Reserve manages the park, as well as the nearby Night Safari, River Wonders, and Jurong Bird Park. There are over 315 animal species in the zoo, with about 16% of them being vulnerable species. Every year, about 2 million people visit the zoo.

Singapore Zoo has always followed the current trend of showing animals in naturalistic, 'open' displays with disguised fences, moats, and glass separating the animals from the viewers. It is home to the world's largest captive orangutan colony.