In a recent Advisory Circular on wildlife hazards to aviation (PDF), the FAA ranked the white-tailed deer as the most dangerous animal, with 84 percent of deer strikes causing damage to the aircraft. The rest of the top 10 hazards are birds, especially the snow goose, turkey vulture and Canada goose. The only other mammal in the top 20 is the coyote. The FAA notes that the ranking includes only species with at least 100 reported strikes of civil aircraft, and the hazard scores are based on the amount of damage and the effect on the flight.
This is a companion discussion topic for the original entry at https://www.avweb.com/news/faa-white-tailed-deer-no-1-strike-hazard