Odd couple: Florida mouse, gopher tortoise have been rooming for centuries – Research News https://www.floridamuseum.ufl.edu/science/odd-couple-florida-mouse-and-gopher-tortoise/
The Florida mouse and gopher tortoise have been in a serious relationship for thousands of years. Theirs is a commensal one: The Florida mouse uses the gopher tortoise’s burrow as shelter from the heat, but the tortoise gains nothing. While the mouse also makes its way into other animals’
but needs shelter from the heat, so it builds a side passageway off of the main tunnel