How much damage do animal-vehicle collisions cost annually?

For deer alone:

"...based on a total estimate of one million deer-vehicle collisions (DVCs) per year in the United States, the estimated total cost associated with DVCs is calculated to be $8,388,000,000 (per year in the United States). Note that collisions with smaller animal species (smaller than deer) and domesticated species (e.g. livestock) were not included in this calculation. A national estimate of vehicle collisions with moose or elk is unavailable."

Wildlife-Vehicle Collision Reduction Study: Report to Congress

Report No. FHWA-HRT-08-034

M.P. Huijser, P. McGowen, J. Fuller, A. Hardy, A. Kociolek, A.P. Clevenger, D. Smith and R. Ament

August 2008