Subcategories - Animals, Endangered Species, Zoology
- Alfred Kinsey
- Animal Welfare Act Regulates Use of Animals in Research
- Animals in War
- Atlantic Salmon Return to the Connecticut River
- August Krogh
- The Bald Eagle Is Removed from the Endangered Species List
- Bison slaughter
- Britain Announces Mad Cow Disease Has Infected Humans
- Brown Orders Medfly Spraying in California
- Buffalo
- Canada Bans the Hunting of Baby Seals
- Captive-Bred Condors and Ferrets Are Reintroduced into the Wild
- Cavalry
- Cimmerian Culture Rises in Russia
- Congress Passes the Endangered Species Act
- Congress Passes the Endangered Species Preservation Act
- Cousteau Announces Large Decline in Ocean Life
- Darling Founds the National Wildlife Federation
- Darwin Publishes On the Origin of Species
- Dogs
- Ernst Haeckel
- The Exxon Valdez Spill Devastates Alaskan Wildlife
- The Fish and Wildlife Service Is Formed
- Fossey Murdered over Efforts to Protect Mountain Gorillas
- Frisch Discovers That Bees Communicate Through Body Movements
- Fur trade
- Genetically Engineered Rabies Vaccine Is Released
- Gray Wolves Are Returned to Yellowstone National Park
- The Great Swamp Wildlife Refuge Is Dedicated
- Harrison Observes the Development of Nerve Fibers in the Laboratory
- Horse Is Domesticated
- Horses
- The Humane Society of the United States Is Established
- An International Convention Protects Endangered Species
- The International Whaling Commission Is Formed
- Ivanov Develops Artificial Insemination
- The Izaak Walton League Is Formed
- Jacques Cousteau
- Jensen Finds PCBs in Animal Tissues
- John James Audubon
- Karl von Frisch
- Kenyan President Burns a Fortune in Ivory
- Kesterson National Wildlife Refuge Is Poisoned
- Khoikhoi and Kwadi Adopt Pastoral Lifestyle
- Konrad Lorenz
- The Last Passenger Pigeon Dies
- Louis Agassiz
- Marcello Malpighi
- The Migratory Bird Act Is Passed
- The Migratory Bird Hunting Stamp Act
