Bison
John Dooly, who owned the island in 1893, is credited for introducing the bison to Antelope Island. The bison population quickly flourished, and by the mid-1900s, the herd increased to over 800 head. Today, there are about 500 bison that roam the island’s grasslands and visitors can see them grazing alongside the pronghorn antelope.
The best way to observe these majestic animals is from afar, as they are wild and tend to become agitated when approached. Bison are known to charge at people when they sense danger. Visitors should also take caution when driving through the park, as visitors can often see bison crossing the roads or roaming alongside them.
Bison in Antelope Island are unique due to their genetics. They come from the original herd introduced to the island, which is pure stock from ancient North American bison. The animals found in Antelope Island State Park are physically different from other state and national parks and have a smaller and more efficient digestive system.
Bighorn sheep
Visitors brought bighorn sheep to Antelope Island State Park in the late-1990s and now roam freely across its grasslands. These majestic creatures are easily identifiable by their large horns, reaching up to three feet long on males and one foot on females.
The bighorn sheep live in small herds of 10 to 15 individuals, led by a dominant ram. They feed on grasses, shrubs, and even cacti when no other food source is available. During the summer months, tourists can see the animals grazing in the early morning and late afternoon hours as they search for food.
Bighorn sheep can be seen throughout the park but tend to stay away from heavily trafficked areas. For the best chance of spotting these animals, visitors should stick to trails that stay away from roads and campsites. Along with bison, they are one of the main attractions at Antelope Island State Park, so keep your eyes peeled while exploring!
Thanks to conservation efforts, their population has grown over the years and is now estimated to be around 200 individuals. For visitors looking to observe these majestic creatures, late spring and early summer is the best time to visit. During this period, the rams often engage in head-butting battles with each other as they compete for dominance within their herd.