Here are a few links to previous criminology-related research focusing on animal rights and the rights of those attempting to protect animals, including efforts to document and prevent environmental threats, using animals as entertainment, sport, and experimentation, the role of patriarchy, the legal status of animals, and the widespread acceptance of treating animals as food.
Crimes Against Animals - Oxford Bibliography
Crimes Against Animals - The Crime Museum
Crimes Against Animals - CBS News
Charging Considerations in Criminal Animal Abuse Cases