  It is commonly known in the literature that large black holes in anti-de
Sitter spacetimes (with reflective boundary condition) are in thermal
equilibrium with their Hawking radiation. Focusing on black holes with event
horizon of toroidal topology, we study a simple model to understand explicitly
how this thermal equilibrium is reached under Hawking evaporation. It is shown
that it is possible for a large toroidal black hole to evolve into a small (but
stable) one.
