noun, plural hi·ber·nac·u·la [hahy-ber-nak-yuh-luh] /ˌhaɪ bərˈnæk yə lə/.
Examples from the Web for hibernaculum
It seems that having migrated to a ledge, the racer promptly finds its hibernaculum and retires for the winter.
Soil temperatures were taken in the present study only when the turtle was in a form, hibernaculum, or den.
Hibernaculum: a tent or sheath made out of a leaf or other material in which a larva hides or hibernates.Explanation of Terms Used in Entomology|John. B. Smith
This trend suggests that over periods of years a racer is likely to shift its range or its hibernaculum or both.
When the hibernaculum is finished the seam is perfectly smooth and the hole inside is lined with silk.Butterflies Worth Knowing|Clarence M. Weed