October is an excellent time to visit Yellowstone National Park. Summer crowds are almost entirely gone so it’s much easier to find solitude in America’s first national park. As fall progresses, bison and elk herds gather in the lowlands to build fat reserves for the coming winter. Grizzly and black bears are still active, with male grizzlies shadowing wolf packs to steal final meals, and females scouting for denning sites. Meanwhile, wolves patrol Lamar and Hayden Valleys, where large concentrations of elk and bison make these areas prime predator-prey arenas.

As the landscape begins to frost over, Yellowstone’s wildlife dons their winter attire. Birds that stay year-round, including eagles and corvids, can be seen soaring overhead, while the park’s smaller predators—bobcats, coyotes, foxes, and badgers—are busy hunting rodents and preparing for pending winter conditions.

We’ll travel in the Roaming Bison American safari van, complete with a pop-top for panoramic views. Custom-designed by two wildlife biologists, this one-of-a-kind vehicle combines comfort with optimal wildlife viewing—it’s a game changer for any nature expedition. October’s cool dawns and dusks are prime times for wildlife observation, and we’ll work to get you to the heart of the action in prime time.

Home to more bird species than any other country on Earth, Colombia is a birder’s paradise. Nearly 2,000 species—about 20 percent of the world’s total—can be found within its borders, from the Caribbean coast to the snowcapped peaks of the Andes. This astonishing diversity reflects Colombia’s wide range of habitats, from lush tropical rainforests and misty cloud forests to sunlit páramos and fertile valleys alive with sound and color.



Our journey focuses on the Andean region, where vibrant tanagers, jewel-like hummingbirds, and shy antpittas inhabit the highland forests and valleys. Along the way, we’ll also keep watch for other wildlife—from playful monkeys to the elusive spectacled bear—and enjoy the warm hospitality that makes Colombia so memorable.

Traveling in December offers a welcome escape from winter in the Northern Hemisphere, trading snow and cold for the soft air and green abundance of the tropics. Guided by an expert local naturalist and accompanied by a Denver-based host, we’ll explore a selection of Colombia’s most celebrated reserves and national parks—each revealing a different facet of the country’s incredible biodiversity.

Birds & Butterflies of Central Mexico

Jan 9-16, 2027

Every winter, millions of monarch butterflies transform the montane cloud forests of central Mexico into a breathtaking spectacle. The Monarch Butterfly Biosphere Reserve is one of nature’s greatest shows—a once-in-a-lifetime experience for any wildlife enthusiast. But the magic doesn’t stop there.

Central Mexico also boasts world-class birding, from the urban oases of Mexico City to the pristine forests of Valle de Bravo. This 8-day adventure with Reefs to Rockies and Denver Audubon blends the thrill of birdwatching with the awe of the monarch migration, all while immersing you in the rich culture and history of Mexico.