Throbb develops frostbite on his wings, which strengthens Goth's determination to get to Hibernaculum. It then creates a larger tent to form a hibernaculum where it hibernates. Shade stays with Marina and finds his colony at Hibernaculum. Similar to snakes, the species will hibernate in a hibernaculum. The cave is a hibernaculum to five different species of bats. They hibernate in winter, sometimes forming a hibernaculum with other bat species in the region. Despite his flaws, Chinook agrees to go with Shade at Hibernaculum. While the Silverwing bats are migrating to Hibernaculum, he gets swept to sea. Siberian tigers most typically attack brown bears in the winter in the bear's hibernaculum. In the winter, "D. rotundifolia" produces a hibernaculum to survive the cold conditions. At Hibernaculum, Bathsheba manages to convince some Silverwings to stay behind. Hellhole is a hibernaculum site for two endangered and federally protected species of bats. In temperate species these roots wither (except in "P. alpina") when the hibernaculum is formed. Then they form a hibernaculum and hibernate for the winter until the start of spring. "Hibernaculum" received mixed-to-positive reviews.