The earliest European zoos in the 19th century were grim places where animals were kept in iron cages. Over time, outright cruelty gave way to a more hidden variety, including cramped enclosures and poor diet. However, this has slowly begun to change. Jersey Zoo, opened in 1959 by Gerald Durrell, focused on the conservation of endangered species rather than just displaying animals. Set in 32 acres, it has spacious, natural enclosures and breeds at-risk species to reintroduce them to the wild.
According to Jersey Zoo director Mark Habben, a zoo's ethics depend on three priorities: a clear conservation focus, a clear research focus, and defined welfare goals. These are also embraced by Chester Zoo, one of the UK's largest. In 2025, it attracted nearly 2.14 million visitors, proving the success of its welfare-centric approach. Its projects protect wild species like the giant pangolin and the eastern bongo, while its breeding programme has successfully yielded chicks of the Socorro dove, which became extinct in the wild in the 1970s.
These "insurance populations" have become vital in our age of rampant poaching and habitat loss. For example, the Arabian oryx was pushed to extinction in the wild in the early 1970s. Yet today, following successful captive breeding programmes by global zoos, thousands live in the wild, and the species is now classified only as "vulnerable". Similarly, the California condor population was boosted from just 22 birds in 1982 to several hundred today.
Animal ethicist Samantha Ward notes that the wild is no longer a safe place where animals roam freely. She works with modern zoos to ensure creatures have the environment and mental stimuli to thrive. In Europe and the UK, stringent regulations govern housing and veterinary care. For visitors traveling abroad, Ward suggests looking for accreditation from international bodies like WAZA to ensure high animal welfare standards.
With 700 million annual zoo visitors worldwide, these institutions are highly valuable for education. A study found that departing visitors felt more positive about conservation and were more likely to take action, such as supporting wildlife charities. Zak Showell, director of Shaldon Wildlife Trust, understands why some people hesitate to visit zoos, but emphasizes that modern standards are very high. Progressive zoos constantly develop their spaces and fund wild preservation, making them well worth defending.