Denver Zoo's Remarkable Journey: From a Single Black Bear to a Conservation Powerhouse

As of November 9th, 2025, Denver Zoo, Colorado's oldest zoo, has cemented its reputation as a conservation and sustainability leader. The zoo's journey began over a century ago with a single orphaned black bear cub named Billy Bryan, who became the first of many creatures the zoo has protected and rehabilitated.

Today, the non-profit Denver Zoo is home to over 3,000 animals and has supported more than 600 conservation projects worldwide, devoting around $2 million annually to these initiatives. The zoo has made considerable strides in its sustainability efforts, aiming to reduce waste by 90% and energy and water use by 45-50% by the end of 2025. This has resulted in a 30% reduction in energy use just this past year through equipment upgrades and automation.

Beyond its conservation work, Denver Zoo offers visitors a unique and engaging experience. Guests can explore the zoo's various themed habitats, from the Down Under habitat with wallabies and tree kangaroos to Primate Panorama, home to gorillas and orangutans. The zoo also features daily demonstrations by animal care experts and the popular Conservation Carousel, where every ride contributes to the zoo's conservation programs.

With its commitment to animal welfare, innovative sustainability practices, and diverse array of attractions, it's no wonder Denver Zoo is climbing the ranks of the best zoos in America and is currently a top 20 attraction in the city.