The term "test animal" refers to any animal that is used in scientific research, experimentation, and testing. However, the usage of this term has come under scrutiny due to ethical concerns surrounding the use of animals for such purposes. Therefore, researchers are actively seeking alternatives to replace animals in testing, such as computer modelling and in vitro testing. Additionally, alternatives terms may be used to describe animals used in research including "lab animals," "experimental animals," or "research subjects." Overall, it is important to consider the implications of language in the context of animal welfare and ensure that language use is accurate and respectful towards all animals involved in research.