A black bear grazes within the Great Sand Dunes National Preserve. NPS Photo. Pikas are an alpine mammal, unexpected in a park known for desert dunes. NPS Photo. Black bears are usually black, but may also be cinnamon or blond. They are most often near riparian areas, where they find an abundance of plants and small animals to eat. Mosca Pass Trail hikers occasionally see bears foraging near Mosca Creek. If you encounter a black bear: